How did God become a man? First we must look at the image of God. When it comes to being a person, having a mind and intentions, we're exactly like God. That implies there can be a kind of 'crossover' between finite and infinite. An analogy: you could say that our body and brain is on one side of a mirror, and our mind/person is on the other side in a subjective reality. For Jesus the man, the mind on the other side of the body/brain was God in God's reality.