The Trinity is a basic doctrine of orthodox Christianity. Yet the word "Trinity" is not found anywhere in the Bible. Is the doctrine of the Trinity really biblical?

The doctrine of the Trinity says that there is one God who exists eternally as three distinct persons, the Father, the Son, and the Holy Spirit. I can assure you that the elements of this doctrine are all taken directly from the Bible.

The first plank of the Trinitarian platform is that there is only one God. The Bible could not be more explicit on this point, which it states explicitly about two dozen times. In Isaiah 44:8 God says that even He does not know of any other gods!

Jesus often spoke of God as His Father, and the apostles frequently spoke of "God the Father." But the New Testament also insists that Jesus is God. For example, Thomas acknowledged Jesus as, "My Lord and my God" (John 20:28), and both Peter and Paul spoke of Jesus as "our God and Savior" (2 Pet. 1:1; Tit. 2:13). Yet the New Testament also makes the distinction between the Father and the Son as two very different persons. In fact they tell us that they love one another, speak to each other, and seek to glorify each other (e.g., John 17: 1-26).

The Old Testament refers often to the Holy Spirit as God at work in the world, without distinction from the Father. But Jesus in John 14 to 16 explained that this Holy Spirit would be sent by the Father at Christ's request. The Holy Spirit would teach and guide the disciples, not speaking on His own initiative, but speaking on Christ's behalf and glorifying Christ. Thus, the Holy Spirit is revealed by Christ to be a third person distinct from the Father and distinct from the Son.

In short, the doctrine of the Trinity is completely and totally biblical, and it is essential that all Christians give assent to this doctrine.