1 Corinthians 2:10–11
10 But xGod hath revealed them unto us yby his Spirit: for the Spirit searcheth all things, yea, the deep things of God. 11 zFor what man knoweth the things of a man, asave the spirit of man which is in him? even so the things of God knoweth no man, but bthe Spirit of God.
See John 14:26.