The Triune God

The word "Trinity" never appears anywhere in the Old or New Testament. However, the concept is there; beginning right in the very first chapter of the Bible. On the sixth day of Creation, God says "Let Us make man in Our image, according to Our likeness" (Genesis 1:26, emphasis added).

It is clear that by "Us" and "Our", God is referring to Himself alone, and not to Himself and the angels. It is clear because in verse 27 the text continues, "So God created man in His own image; in the image of God He created them; male and female He created them".

So right from the start, we read of God referring to Himself in plural form; even though the Scriptures very clearly teaches that there is only one God (Deuteronomy 6:4, Isaiah 45:5, 1 Timothy 2:5).

God speaks the same way at the Tower of Babel, saying "Come, let Us go down there and confuse their language, that they may not understand one another's speech" (Genesis 11:7, emphasis added).

Much later, when God first appeared in a vision to the prophet Isaiah, He asked "Whom shall I send, and who shall go for Us?" (Isaiah 6:8, emphasis added).

And the Psalmist, David wrote "The LORD said to my Lord, 'Sit at my right hand, until I make Your enemies Your footstool.'" (Psalm 110:1). 

Jesus referenced this passage when He asked "How is it that the scribes say that the Christ is the Son of David? For David himself said by the Holy Spirit: 'The LORD said to My Lord, Sit at My right hand, till I make Your enemies Your footstool. Therefore David himself calls Him 'Lord', how is He then his Son?" (Mark 12:35).

Jesus was challenging His listeners to understand that He, the Messiah, is more than just the Son of David. He is the Son of God. 

Jesus is sometimes referred to as both the Root and the Branch of Jesse. Jesse was the name of David's father. This title, given to Jesus, is based on a couple of verses in the 11th chapter of the Book of the Prophet Isaiah. 

Isaiah 11:10  says "And in that day there shall be a Root of Jesse, who shall stand as a banner to the people; for the Gentiles shall seek Him, and His resting place shall be glorious". Isaiah 11:1 says "There shall come forth a Rod from the stem of Jesse, and a Branch shall grow out of his roots" (also see Revelation 22:16).

As the song from the O.C. Supertones' first album says "Jesus came from Jesse, but Jesse came from Jesus." Jesus is both the Root and the Branch of Jesse. This is a Christological concept. And Christology is, of course, tied in with the doctrine of the Trinity. Jesus in not only the Son of Man through David's line. He is also the Son of God from whom David's line originated.

And whereas the Old Testament gives compelling hints of the Trinitarian doctrine, the New Testament abounds with it. Take just for example the Great Commission, given by Jesus as He sent out His apostles before He ascended to the Father. He said "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" (Matthew 28:19; also see Matthew 3:16-17, John 1:1, John 1:14).

God is love (1 John 4:8). And love has existed between the Father, Son, and Holy Spirit from eternity past. As C.S. Lewis pointed out in Mere Christianity; what we mean by saying "God is love" is "that the living, dynamic activity of love has been going on in God forever and has created everything else" (book 4, chapter 4, paragraph 5).