Those who do not accept the Trinity doctrine reject it in part because the word "Trinity" is not found in Scripture. Of course, there is no verse that says "God is three Persons" or "God is a Trinity." This is all quite evident and true, strictly speaking, but it proves nothing. There are many words and phrases that Christians use, which are not found in the Bible. For example, the word "Bible" is not found in the Bible.

More to the point, opponents of the Trinity doctrine claim that a Trinitarian view of God’s nature and being can’t be proven from the Bible. Since the books of the Bible are not written as theological tracts, this may seem on the surface to be true. There is no statement in Scripture that says, "God is three Persons in one being, and here is the proof."