1 Corinthians 2:11
What human being can understand the thoughts of a man, except the man's own inner spirit? So too no one understands the thoughts of God, except the Spirit of God.
Romans 2:15
they exhibit the effect of the Law written on their hearts, their conscience bears them witness, as their moral convictions accuse or it may be defend them.)
2 Corinthians 4:2-6
I disown those practices which very shame conceals from view; I do not go about it craftily; I do not falsify the word of God; I state the truth openly and so commend myself to every man's conscience before God.
Hebrews 4:12-13
For the Logos of God is a living thing, active and more cutting than any sword with double edge, penetrating to the very division of soul and spirit, joints and marrow ??scrutinizing the very thoughts and conceptions of the heart.
1 John 3:19-21
Thus it is that we may be sure we belong to the truth and reassure ourselves