One of the mysteries of the Bible is the nature of God himself; that God is Trinity.
Trinity means tri-unity – three in oneness. There is diversity in unity.
God is three persons (Father, Son and Holy Spirit) and each person in fully God.
Yet, we believe in one God, not three.
The word “Trinity” does not occur in the Bible and opponents of Christianity are very quick to point that out. But the Bible certainly teaches the fact that God is Trinity.
There are many other words that do not occur in the Bible either.