1 Corinthians 2:10-12

But God has shown us these things through the Spirit. The Spirit searches out all things, even the deep secrets of God. Who knows the thoughts that another person has? Only a person’s spirit that lives within him knows his thoughts. It is the same with God. No one knows the thoughts of God except the Spirit of God. Now we did not receive the spirit of the world, but we received the Spirit that is from God so that we can know all that God has given us.