The trinity is a concept that a lot of Christians just believe, but never really take the time to understand. No one can defend something they don’t understand. Even though, the word “trinity” isn’t used in the Bible, the Bible doesn’t forbid the use of extrabiblical language to describe its doctrines.
There are three basic principles that can help people understand the trinity.
Principle 1–There is only one God.
This one seems obvious, but Mormons and Jehovah’s Witnesses are already disqualified. Christianity, Judaism and Islam are the only major religions that are monotheistic. There are many, many verses that say there is only one God, but a few are Deuteronomy 6:4, Isaiah 43:10, John 5:44, and 1 Corinthians 8:4.
Principle 2–There Are Three Divine Persons.
The Father, Yahweh, is God–Deuteronomy 4:35, Isaiah 44:6, etc.
Jesus is God–John 1:1, Isaiah 9:6, Acts 20:28, etc.
The Holy Spirit is God–Acts 5:3-4, 2Corinthians 3:17, etc.
Principle 3–The Three Persons Are Co-Eternal. Each of the three persons has no beginning and no end.
The Father is eternal–Psalm 90:2, 102:26-27, Malachi 3:6.
Jesus is eternal–John 8:58, Colossians 1:17, Hebrews 1:11-12, 13:8.
The Holy Spirit is eternal–Hebrews 9:14.
If those three principles are true, the only logical possibility is the trinity.
Jesus said, “I told you that you would die in your sins; if you do not believe that I am the one I claim to be, you will indeed die in your sins” (John 8:24). How far off can we be in our understanding of who Jesus is, and still not die in our sins? I’d like to hear anyone’s thoughts.