(image courtesy slideplayer.com)
By Spencer D Gear PhD
I refer you to my previous articles that document the biblical teaching on the Father, Son and Holy Spirit each being regarded as God. The second link below raises some objections to the Trinity.
Is the Trinity taught in the Bible?
Problems with the Trinity
This study begins with an assessment of some indications of Father, Son and the Holy Spirit of the Trinity in the Old Testament. It also deals with actions of the separate Persons in the Trinity throughout the Bible.
1. Hints of the Trinity in the Old Testament 
This is not a comprehensive list but give a few indications of the Trinity in the Old Testament.
1.1 Plural nouns and pronouns are applied to God
See: Gen. 1:26; 3:22; 11:6, 7; 20:13; 48:15; Isa. 6:8. The plurality of the Godhead also is indicated in Gen 1:1, 26 and 48:15-16.
For example, Gen 1:1 (NIV) states, ‘In the beginning God created the heavens and the earth’. The word translated ‘God’ is Elohim. It is an abstract plural.
The term includes, as a plural, all persons in the Trinity but itself does not declare the fact. There is a plurality of persons. It is a title, not a name, denoting either intensification of the original meaning, or is a plural of that majesty which is deity (Stigers 1976:50).
Francis Schaeffer explained this with precision for our contemporary culture:
When we read, “in the beginning God created the heavens and the earth,” we are not left with something hung in a vacuum: Something existed before creation and that something was personal and not static; the Father loved the Son; there was a plan; there was communication; and promises were made prior to the creation of the heavens and the earth. This whole conception is rooted in the reality of the Trinity. Without the Trinity, Christianity would not have the answers that modern man needs (Schaeffer 1976:18).
1.2 God’s name is plural (Elohim) and the verb is singular.
The verb, “Come,” in Gen. 11:7 is really in the plural and must be addressed to at least two others. This seems not to be the angels as God SENDS them. The NLT translates as, “Come, let’s go down and confuse the people with different languages. Then they won’t be able to understand each other”.
Neither is Gen. 1:26 addressed to angels because in the next verse we are told, “So God created man in his own image, in the image of God he created him; male and female he created them” (ESV), or as in the NLT, ‘So God created human beings in his own image. In the image of God he created them; male and female he created them”.
2. More OT indicators of plurality in unity
This sounds like strange language but there is biblical evidence that indicates …
2.1 Jehovah is distinguished from Jehovah
See Gen. 19:24 and Hosea 1:7. Genesis 19:24 (NIV) states: ‘Then the Lord rained on Sodom and Gomorrah sulfur and fire from the Lord out of heaven’. There are intricacies in this text in understanding how the ‘LORD rained’ and ‘from the LORD out of heaven’.
One of the finest commentaries with a high view of Scripture is by H C Leupold, Exposition of Genesis. Of Gen 19:24 he wrote:
The view which the church held on this problem from days of old is still the simplest and the best…. “God the Son brought down the rain from God the Father,” as the Council of Sirmium worded the statement. To devaluate the statement of the text to mean less necessitates a similar process of devaluation of a number of other texts like Ge 1:26, and only by such a process can the claim be supported that there are no indications of the doctrine of the Trinity in Genesis. We believe the combined weight of these passages, including Ge 1:1, 2, makes the conclusion inevitable that the doctrine of the Holy Trinity is in a measure revealed in the Old Testament, and especially in Genesis (Leupold 1942:570).
2.2 Jehovah has a son
See Ps. 2:7; cf. John 3:16, 18; 9:36; Rom. 1:7; Heb. 1:6). He was a son before he was “given” (Isa. 9:6); Micah 5:2 (ESV) “whose origin is from of old, from ancient days”; he is called “the mighty God” (Isa. 9:6).
2.3 The Spirit is distinguished from God (the Father)
See Gen. 1:1-2; 6:3; Num. 27:18; Ps. 51:11; Isa. 40:13; 48:16; Hag. 2:4-5.
This is evident from Gen 1:1-2 (NET): ‘In the beginning God created the heavens and the earth. Now the earth was without shape and empty, and darkness was over the surface of the watery deep, but the Spirit of God was moving over the surface of the water’.
Here, Elohim (God) created while Ruach (the Spirit of God) moved over the waters. We have plurality in the one God in action, thus providing early indications of the Trinity.
2.4 “The angel of Jehovah” is regarded as a pre-incarnate manifestation of the Logos, the Son
An exception is Hag. 1:13 where Haggai himself is the “messenger” which is the same word as “angel”.
Examples of the angel of the Lord manifestations include to Hagar (Gen. 16:7-14); to Abraham (Gen. 22:11-18); to Moses (Ex. 3:2-5); to Elijah (1 Kings 19:5-7), etc. In Gen. 18, one of the “men” who appeared to Abraham is repeatedly represented as Jehovah (vv. 13, 17, 20, 22-23).
2.5 The three-some of Isa. 6:3 (“Holy, holy, holy is Jehovah of hosts”)
See also the Aaronic benediction (Num. 6:24-26) that could point to the Trinity. Although this is a three-fold benediction, there is only one God who blesses. cf. Rev. 4:8.
The Scriptures declare Father, Son and Holy Spirit each is God, as I’ve explained in the article, Is the Trinity taught in the Bible? How do we know these three are Persons in the Godhead?
3. How do Father, Son and Holy Spirit relate in the Godhead?
These diagrams by Wayne Grudem are the most helpful I’ve seen for explaining the Trinity, comparing false views with his orthodox understanding. Originally they were from Grudem (1994:253-258).
This (to the left) is an heretical view of the Trinity where God’s being is divided into three equal parts, Father, Son and Holy Spirit – thus making three Gods. The Athanasian Creed was written to address this error.
Since I’m examining the personhood of each member of the Trinity, how can we speak of Father, Son and Holy Spirit in unity and yet they are separate persons. ‘If each person is fully God and has all of God’s being, then we also should not think that the personal distinctions are any kind of additional attributes added on to the being of God, like this pattern (to the left).
Human beings (and I’m one of them) find it difficult to comprehend the nature of the Trinitarian God. However, this teaching is straight from Scripture. Analogies fail and diagrams have disadvantages. It is essential doctrine that we understand ‘each person of the Trinity has all of the attributes of God, and no one person has any attributes that are not possessed by the others’ (Grudem 1994:253).
‘The three persons of the Trinity are not just three different ways of looking at the one being of God’.
‘What are the differences between Father, Son and Holy Spirit? There is no difference in attributes at all. The only difference between them is the way they relate to each other and to the creation (Grudem 1994:254).
While Grudem regarded the above three diagrams as flawed representations of the Trinity, he considered this diagram (to the left), although imperfect, was a representation of the orthodox understanding of the Trinity.
In this diagram (to the left), the Father is represented as the section of the circle designated by F, and also the rest of the circle, moving around clockwise from the letter F; the Son is represented as the section of the circle designated by S, and also the rest of the circle, moving around clockwise from the letter S; and the Holy Spirit is represented as the section of the circle marked HS and also the rest of the circle, moving around clockwise from the HS. Thus, there are three distinct persons, but each person is fully and wholly God. Of course the representation is imperfect, for it cannot represent God’s infinity, or personality, or indeed any of his attributes. It also requires looking at the circle in more than one way in order to understand it: the dotted lines must be understood to indicate personal relationship, not any division in the one being of God. Thus, the circle itself represents God’s being while the dotted lines represent a form of personal existence other than a difference in being. But the diagram may nonetheless help guard against some misunderstanding….
Because the existence of three persons in one God is something beyond our understanding, Christian theology has come to use the word person to speak of these differences in relationship, not because we fully understand what is meant by the word person when referring to the Trinity, but rather so that we might say something instead of saying nothing at all.
Can We Understand the Doctrine of the Trinity? We should be warned by the errors that have been made in the past. They have all come about through attempts to simplify the doctrine of the Trinity and make it completely understandable, removing all mystery from it. This we can never do. However, it is not correct to say that we cannot understand the doctrine of the Trinity at all. Certainly we can understand and know that God is three persons, and that each person is fully God, and that there is one God. We can know these things because the Bible teaches them. Moreover, we can know some things about the way in which the persons relate to each other…. But what we cannot understand fully is how to fit together those distinct biblical teachings. We wonder how there can be three distinct persons, and each person have the whole being of God in himself, and yet God is only one undivided being. This we are unable to understand. In fact, it is spiritually healthy for us to acknowledge openly that God’s very being is far greater than we can ever comprehend. This humbles us before God and draws us to worship him without reservation (Grudem 1994:255-256).
I found Grudem’s diagrams of the errors and a suggested solution to be first-rate when confirming the deity of each person of the Trinity and expressing the differentiation of persons in the Godhead.
Louis Berkhof’s assessment is profound:
It is especially when we reflect on the relation of the three persons to the divine essence that all analogies fail us and we become deeply conscious of the fact that the Trinity is a mystery far beyond our comprehension. It is the incomprehensible glory of the Godhead (Berkhof 1939/1941:88)?
4. Duties of each person
(image courtesy slide 6, slideshare.net)
For practical purposes, what does each member of the Godhead do differently from the others? How do the ‘job descriptions’ differ?
Personhood normally has the attributes of
intellect, feeling, and will. All three of these characteristics are attributed to all three members of the Trinity in Scripture [which I’ll discuss below]. Essentially, personhood refers to an “I,” a “who,” or a subject. Each “I” in the Trinity possesses (by virtue of its common nature) the power to think, feel, and choose. Personhood itself is its I-ness or who-ness (Geisler 2003:379).
4.1 God the Father is a person
Which biblical evidence verifies the Father’s activities as that of a person (acting as ‘You’ or ‘He’):
The Father is a person who has attributes of personhood:
Intellect: According to Matt 6:32, ‘For the pagans run after all these things, and your heavenly Father knows that you need them’ (NIV);
Emotional attribute to feel: Gen 6:6 (NIV), ‘The Lord regretted that he had made human beings on the earth, and his heart was deeply troubled‘.
The will. The Father has power to choose. See Matt 6:9-10 (NIV), ‘Our Father in heaven, hallowed be your name, your kingdom come, your will be done, on earth as it is in heaven. Our Father in heaven, hallowed be your name, your kingdom come, your will be done, on earth as it is in heaven’.
The ability to communicate: Matt 11:25, ‘At that time Jesus said, ‘I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children‘.
Teach: “Jesus answered, ‘My teaching is not my own. It comes from the one who sent me. Anyone who chooses to do the will of God will find out whether my teaching comes from God or whether I speak on my own'” (John 7:16).
4.2 Jesus the God-man is a person
He demonstrates the attributes of personhood as demonstrated in Scripture:
He has the power of intellect according to John 2:25 (NLT), ‘No one needed to tell him about human nature, for he knew what was in each person’s heart’.
He had feelings for people: ‘Jesus wept’ (John 11:35). ‘But as he came closer to Jerusalem and saw the city ahead, he began to weep’ (Luke 19:41). Luke 10:21 exposes another side of Jesus’ emotions:
‘At that same time Jesus was filled with the joy of the Holy Spirit, and he said, “O Father, Lord of heaven and earth, thank you for hiding these things from those who think themselves wise and clever, and for revealing them to the childlike. Yes, Father, it pleased you to do it this way”’ (Luke 10:21).
You may disagree that joy is a feeling or an emotion. What then is it? This article from God Questions supports what I understand is the biblical view that joy is an emotion: Is there a difference between joy and happiness?
The will of Jesus: In John 6:38 Jesus declared, ‘For I have come down from heaven to do the will of God who sent me, not to do my own will’. These three verses indicate Jesus had the power of the will:
Just as my Father knows me and I know the Father. So I sacrifice my life for the sheep….
“The Father loves me because I sacrifice my life so I may take it back again. No one can take my life from me. I sacrifice it voluntarily. For I have the authority to lay it down when I want to and also to take it up again. For this is what my Father has commanded” (John 10:15, 17-18).
Jesus taught (attribute of a person): ‘Anyone who wants to do the will of God will know whether my teaching is from God or is merely my own.
As the God-man, Jesus had the characteristics of a physical being – a person: He became tired (John 4:6), got thirsty (John 19:28) and hungry (Matthew 4:2). He developed physical weakness (Matthew 4:11; Luke 23:26). He died (Luke 23:46). He had a real human body after his resurrection (Luke 24:39; John 20:20, 27).
4.3 God the Holy Spirit is a person
Like the Father and the Son, the Holy Spirit had attributes of personhood. ‘He’ was not an impersonal ‘it’.
John 14:26 demonstrates the Holy Spirit ‘reminds’ and teaches: ‘But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you’.
Ephesians 4:30 expresses the feelings of the Holy Spirit: ‘And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption’. Also, ‘and so I tell you, every kind of sin and slander can be forgiven, but blasphemy against the Spirit will not be forgiven’ (Matt 12:31). The Spirit can be insulted: ‘So think how much more punishment people deserve who show their hate for the Son of God—people who show they have no respect for the blood sacrifice that began the new agreement and once made them holy or who insult the Spirit of God’s grace’ (Heb 11:29 ERV).
This is another dimension of the Holy Spirit’s feelings: ‘Then the church throughout Judea, Galilee and Samaria enjoyed a time of peace and was strengthened. Living in the fear of the Lord and encouraged by the Holy Spirit, it increased in numbers’ (Acts 9:31).
1 Corinthians 12:11 demonstrates that the Holy Spirit has a will to dispense the gifts: ‘It is the one and only Spirit who distributes all these gifts. He alone decides which gift each person should have’ (NLT).
John 16:13 refers to the ‘Spirit of truth’ with the Greek masculine, ekeinos, i.e. ‘He’ and not ‘it’, although pneuma (Spirit) is neuter gender: ‘But when he, the Spirit of truth, comes, he will guide you into all the truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come’ (NIV)
The Person of the Holy Spirit has the attributes of being a ‘he’ who guides, speaks and hears.
There is more NT evidence that the Spirit ‘searches, knows, speaks, testifies, reveals, convinces, commands, strives, moves, helps, guides, creates, recreates, sanctifies, inspires, intercedes, orders the affairs of the church, and performs miracles (see Gen 6:3; Luke 12:12; John 3:8; 16:7-8; Acts 8:29; Rom 8:26; 1 Cor 2:11; Eph 4:30; 2 Peter 1:21, etc’.
4.4 Communication within the Godhead
Another dimension to better understand the persons in the Trinity is to be aware of the ‘many times in Scripture one member of the Trinity is speaking to another. This indicates that they are not one and the same person’ (Geisler 2003:288).
4 .4.1 The Father speaks to the Son
Hebrews 1:5 (quoting Psalm 2:7) states: ‘For to which of the angels did God ever say, “You are my Son; today I have become your Father”? Or again, “I will be his Father, and he will be my Son”’.
Psalm 110:1 states, ‘The Lord (Father) says to my Lord (Son): “Sit at my right hand, until I make your enemies your footstool’ (ESV). Jesus used this Scripture to demonstrate his deity in Matt 22:41-46.
See also Psalm 45:6-7; Heb 1:8-9 and three examples where God, the Father, spoke from heaven approving Jesus Christ, the Son (Matt 3:17; 17:5; John 12:28).
4.4.2 The Son speaks to the Father
In Zechariah 1:12 we read: ‘Upon hearing this, the angel of the Lord [regarded as the Son] prayed this prayer: “O Lord [Yahweh] of Heaven’s Armies, for seventy years now you have been angry with Jerusalem and the towns of Judah. How long until you again show mercy to them?”’ (NLT) Yahweh, the ‘I AM’ of Exodus 3:14 is the name reserved for God alone.
Both Father and Son are referred to in Prov 30:4 (NLT),
Who but God goes up to heaven and comes back down? Who holds the wind in his fists? Who wraps up the oceans in his cloak? Who has created the whole wide world? What is his name—and his son’s name? Tell me if you know!
In the NT there is a similar emphasis of the Son communicating with the Father:
John 17:1, ‘After saying all these things, Jesus looked up to heaven and said, “Father, the hour has come. Glorify your Son so he can give glory back to you”’.
Luke 23:46, ‘Then Jesus shouted, “Father, I entrust my spirit into your hands!” And with those words he breathed his last’.
4.4.3 The Spirit acting separately from the Father and the Son, but connected with personal acts performed by them
Strong (1907:325) explained:
Matt. 3:16 – 17, “ And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased”; Luke 3:21- 22, ‘Now when all the people were baptized, and when Jesus also had been baptized and was praying, the heavens were opened, and the Holy Spirit descended on him in bodily form, like a dove; and a voice came from heaven, “You are my beloved Son; with you I am well pleased”’.
4.4.4 The three persons speaking together
These are but three examples:
Isaiah 63:7-10 (ESV):
I will recount the steadfast love of the Lord,
the praises of the Lord,
according to all that the Lord [Father] has granted us,
and the great goodness to the house of Israel
that he has granted them according to his compassion,
according to the abundance of his steadfast love.
8 For he said, “Surely they are my people,
children who will not deal falsely.”
And he became their Saviour.
9 In all their affliction he was afflicted,
and the angel of his presence [Son] saved them;
in his love and in his pity he redeemed them;
he lifted them up and carried them all the days of old.
10 But they rebelled
and grieved his Holy Spirit;
therefore he turned to be their enemy,
and himself fought against them.
Here Father, Son and Holy Spirit act together.
We also see this co-operative action at Jesus’ baptism:
And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased” (Matt 3:16-17).
In the baptism formula given in Matt 28:19 it is stated: ‘Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit’. ‘Name’ is singular.
There are a number of other examples that there are three different and distinct persons existing concurrently and eternally and share the same essence or nature of the one God (e.g. 2 Cor 13:14).
‘This is in stark contrast to modalism (sabellianism), which claims there is only one person in God who appears at different times in the form of different persons’ (Geisler 2003:289).
4.4.5 The three persons acting together
In Jesus’ resurrection, we see the three persons of the Godhead acting together:
(1) The Spirit raised Jesus from the dead (Rom 8:11 NLT);
(2) The Father raised Jesus from the dead (Acts 2:32-33 NLT);
(3) Jesus raised Jesus from the dead (John 10:18 NLT).
Dr Walter Martin, founder of the Christian Research Institute, rejected the Trinity description as a triplex. A triplex is ‘a building divided into three self-contained residences’ or ‘a flat on three floors’ (Lexico 2019. s.v. triplex). A triplex consists of 3 separate substances and is complex.
Martin’s statement was: ‘God is not triplex (1+1+1)—He is triune (1X1X1), and he has revealed Himself fully in the Person of our Lord, Jesus Christ (Col. 2:9, John 14:9).” — Christian Research Institute tract, Jehovah’s Witnesses and the Trinity’ (cited in, Is the Trinity a Biblical Concept? Ex-Jehovah’s Witnesses for Jehovah).
St Augustine rejected this view. He explained it in On the Trinity:
Chapter 7.–God is a Trinity, But Not Triple (Triplex).
But God is truly called in manifold ways, great, good, wise, blessed, true, and whatsoever other thing seems to be said of Him not unworthily: but His greatness is the same as His wisdom; for He is not great by bulk, but by power; and His goodness is the same as His wisdom and greatness, and His truth the same as all those things; and in Him it is not one thing to be blessed, and another to be great, or wise, or true, or good, or in a word to be Himself.
9. Neither, since He is a Trinity, is He therefore to be thought triple (triplex)  otherwise the Father alone, or the Son alone, will be less than the Father and Son together. Although, indeed, it is hard to see how we can say, either the Father alone, or the Son alone; since both the Father is with the Son, and the Son with the Father, always and inseparably: not that both are the Father, or both are the Son; but because they are always one in relation to the other, and neither the one nor the other alone. But because we call even the Trinity itself God alone, although He is always with holy spirits and souls, but say that He only is God, because they are not also God with Him; so we call the Father the Father alone, not because He is separate from the Son, but because they are not both together the Father.
 [The Divine Unity is trinal, not triple. The triple is composed of three different substances. It has parts, and is complex. The trinal is without parts, and is incomplex. It denotes one simple substance in three modes or forms. “We may speak of the trinal, but not of the triple deity.” Hollaz, in Hase’s Hutterus, 172.–W.G.T.S.]
‘Trinal’ means ‘having three parts; threefold; triple’ (yourdictionary.com 2019. s.v. trinal).
Scriptural reasons for my conclusion re the persons of the Trinity are spread through this article. Each person of the Trinity being regarded as God, and the biblical basis for such, is in my earlier article, Is the Trinity taught in the Bible? A couple other verses are included in a polemical article, Problems with the Trinity.
4.5 Don’t forget the implications of John 14:28
This verse states: ‘You heard me say to you, “I am going away, and I will come to you.” If you loved me, you would have rejoiced, because I am going to the Father, for the Father is greater than I’ (John 14:28 ESV).
This verse leads us to a very important dimension of the Trinity:
Father, Son and Holy Spirit are co-equal and co-eternal in the Trinitarian godhead. Each member of the Trinity has an identical essence. By essence I mean nature. Therefore, God has one nature but Scripture confirms there are three distinct persons who are God. All are called God so are co-equal and are eternal, i.e. co-eternal.
This does not exclude a purposeful (functional) order in the Trinity. This perfect design or focus can be explained as a ‘functional subordination’ among the persons and not a subordination of being (i.e. ontological subordination). If the being of the Father were superior to the being of the Son who is superior to the Holy Spirit, the three persons in the Godhead could not each be God in nature – which is not the case. For an examination of these details, see my article, Is the Trinity taught in the Bible?
R C Sproul explained this functional subordination (technically labelled in theology by a misleading title, ‘the economic Trinity’):
What are the individual, personal qualities that belong to the three persons of the Godhead? From all eternity, the Father begets the Son [Heb 1:5-6, 8]; the Son is begotten by the Father [Jn 1:14, 18], and the Holy Spirit proceeds from the Father and the Son [Jn 15:26, Gal 4:6]” (WLC 10). With regard to the economic Trinity, we distinguish among the three persons of the Godhead in terms of their roles in creation and redemption. It is the Father who sends the Son into the world for our redemption. It is the Son who acquires our redemption for us. It is the Spirit who applies that redemption to us. We do not have three gods. We have one God in three persons, and the three persons are distinguished in the economy of redemption in terms of what they do (Sproul 2014).
This functional subordination can be summarised:
‘The Father is the Planner, the Son is the Accomplisher, and the Holy Spirit is the Applier of salvation to believers. The Father is the Source, the Son is the Means, and the Holy Spirit is the Effector of salvation—it is He who convicts, convinces, and converts…. [The nature and duration of this subordination] is not just temporal and economical: it is essential and eternal…. Paul wrote:
After that the end will come, when he will turn the Kingdom over to God the Father, having destroyed every ruler and authority and power…. Then, when all things are under his authority, the Son will put himself under God’s authority, so that God, who gave his Son authority over all things, will be utterly supreme over everything everywhere (1 Cor 15:24, 28 NLT)’ (Geisler 2003:291).
Norman Geisler, eminent apologist and theologian, who left this earth to be present with the Lord on 1 July 2019 when I was preparing this article, provided this precise conclusion to how three persons can be one God:
By saying God has one essence and three persons it is meant that he has one ‘What’ and three ‘Whos.’ The three Whos (persons) each share the same What (essence). God is a unity of essence with a plurality of persons. Each person is different, yet they (sic) share a common nature (Geisler 1999:732).
 Based on Thiessen (1949:136-145).
 The Council of Sirmum was held between AD 357 and 359. See: http://www.self.gutenberg.org/articles/eng/Council_of_Sirmium (Accessed 12 July 2019).
 The commentary is online at Bible Hub: Exposition of Genesis: Vol 1. Available at: https://biblehub.com/library/leupold/exposition_of_genesis_volume_1/index.html (Accessed 12 July 2019).
 I copied them from Calvary Baptist Church, Available at: http://www.calvarydothan.com/public/system/PodcastOutlines/2017_03_15_1.pdf (Accessed 5 July 2019).
 This section is based on formation from Geisler (2003:287-288).
 Much of this summary of the Persons in the Godhead is based on Geisler (2003:287).
 These personal characteristics were given by Mathis (2016).
 Geisler (2003:288). This list of personal actions by the Holy Spirit in Geisler mainly comes from Augustus Strong’s Systematic Theology (1907:324).
 Much of this section is from Geisler (2003:288-289).
 In the Bible quotes I have replaced the KJV with the ESV here.
 Modern translations replace the older word, ‘begets’, with something more comprehensible to modern readers: ‘For God never said to any angel what he said to Jesus: “You are my Son. Today I have become your Father [or today I reveal you as my Son’ (quoting Ps 2:7) NLT.
 WLC refers to the Westminster Larger Catechism. I have quoted from a modernised English version of the WLC. Available at: https://dansonnenberg.com/2015/12/21/the-westminster-larger-catechism-modern-english-version/ (Accessed 11 July 2019).
 As I wrote this portion of the article on 5 July 2019 I learned of Dr Geisler’s death. See Toalston (2019).
 Grammatically, ‘each person’ is singular and ‘their’ is a plural possessive pronoun. The correction of this sentence should be: ‘Each person is different, yet he shares a common nature’. Or, better: ‘Every person (plural) is different, yet they (plural) share a common nature’. You can tell I’m a grammar policeman.
 However, I’m aware of the challenges made to Geisler’s view of ‘persons’ in the Godhead in ‘The Error of Insisting on Three “Persons” as a Litmus Test of Orthodoxy’ (Contending for the Faith).
7. Works consulted
Berkhof, L 1939/1941. Systematic theology (online). London: The Banner of Truth Trust. Available at: http://archive.org/stream/SystematicTheology/93884037-Louis-Berkhof–Systematic-Theology_djvu.txt (Accessed 5 July 2019).
Geisler, N L 1999. Trinity. Baker encyclopedia of Christian apologetics. Grand Rapids, Michigan: Baker Books.
Geisler, N 2003. Systematic theology, vol 2: God, creation. Minneapolis, Minnesota: BethanyHouse.
Grudem, W 1994. Systematic theology. Grand Rapids, Michigan: Zondervan Publishing House.
Mathis, D 2016. Jesus is fully human. Desiring God (online), 15 December. Available at: https://www.desiringgod.org/articles/jesus-is-fully-human (Accessed 10 July 2019).
Schaeffer, F A 1976. Genesis in space and time. London: Hodder and Stoughton (1972. Downers Grove, Illinois: InterVarsity Press).
Sproul, R C 2014. What’s the Difference between the Ontological and the Economic Trinity? Ligonier Ministries (online), 15 August. Available at: https://www.ligonier.org/blog/whats-difference-between-ontological-and-economic-trinity/ (Accessed 11 July 2019).
Stigers, H G 1976. A Commentary on Genesis. Grand Rapids, Michigan: Zondervan Publishing House.
Strong, A 1907. Systematic theology, 3 vols in 1. Philadelphia: The Judson Press. Project Gutenberg EBook. Available at: https://www.gutenberg.org/files/44035/44035-h/44035-h.html (Accessed 10 July 2019).
Thiessen, H C 1949. Lectures in systematic theology. Grand Rapids, Michigan: Wm. B. Eerdmans Publishing Company.
Toalston, A 2019. Norman Geisler, defender of Christian faith, dies, Baptist Press (online), 2 July. Available at: http://www.bpnews.net/53217/norman-geisler-defender-of-christian-faith-dies (Accessed 5 July 2019).
Copyright © 2019 Spencer D. Gear. This document last updated at Date: 20 April 2020.