1 Corinthians 2:11
For who among men knoweth the things of a man, but the spirit of the man which is in him? even so the things of God knoweth no one but the Spirit of God.
Romans 2:15
since they show that what the Law requireth is written in their hearts, their conscience bearing witness, and their thoughts in turn accusing or defending them;
2 Corinthians 4:2-6
but have renounced the hidden things of shame, not walking in craftiness, nor adulterating the word of God, but by the manifestation of the truth commending ourselves to every mans conscience in the sight of God.
Hebrews 4:12-13
For the word of God is living, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, both the joints and marrow, and is a discerner of the thoughts and intents of the heart;
1 John 3:19-21
And hereby we know that we are of the truth, and shall assure our hearts before him;