1 Corinthians 2:11
For what man knows the depths of man except the man's own inner Spirit? Even so, also, the Spirit of God knows the deeps profound of God.
Romans 2:15
For they show that the work of the Law is written in their hearts, while their conscience bears them witness, as their reasonings accuse, or it may be defend, them,
2 Corinthians 4:2-6
I have renounced the hidden things of shame, not spending my life in craftiness, nor adulterating the word of God; but setting forth the truth openly, I strive to commend myself to every man's conscience as in the sight of God.
1 John 3:19-21
By this we shall come to know that we are really of the truth,