there are levels of understanding. and at each level - people can get into errors - because they see in part, and dimly - as the Bible says, through Paul - 1 Cor 13.
but even without Paul - if we do as the Bible says we have to - become as a Child - we can begin to learn - wherever we have stopped learning - due to errors in our thinking, or maybe at a level of understanding in one doctrine or another - and not realizing that it is just a level - not the whole, or as we could understand it - if we continued to learn, continued to seek truth - and want to learn - and learn to - how to learn even - more as children do - with a more open mind and heart and a simplicity of Thought - uncomplicated yet - by the World - or by (as in Religion) - by doctrines and dogmas (of Man/Woman).