How can I understand the Trinity?
The Doctrine of the Trinity is difficult to understand because our finite human brains are unable to fully conceive of an infinite being. However, God's Word gives us everything we need to come to an understanding of the nature of God as a Triune Being.
The Bible teaches that the Father is God, Jesus is God, and the Holy Spirit is God — and that there is only one God. Each Person of the Trinity is Himself distinct. We often simply state this as: The Trinity is one God, existing in three Persons (remember this does not mean three Gods. It means three distinct Persons, ONE God).
The word Trinity is not found in Scripture but the foundation for our doctrinal understanding and definition of it is most definitely found there. Trinity is understood to be synonymous with the term Triune God—three coexistent, co-eternal and co-equal Persons who are one God. Let’s look at some scriptural references to better understand the Trinity.
There is One God
"Hear, O Israel: The LORD our God is one LORD..." (Deuteronomy 6:4).
"...we know that an idol is nothing in the world, and that there is none other God but one" (1 Corinthians 8:4).
"Now a mediator is not a mediator of one, but God is one" (Galatians 3:20).
"For there is one God, and one mediator between God and men, the man Christ Jesus..." (1 Timothy 2:5).