1 Corinthians 2:11
For what man knows the things of man, but the spirit of man which is in him? Even so, the things of God no one knows, but the Spirit of God.
Romans 2:15
For when the Gentiles, who have not a law, do, by nature, the things of the law, these who have not a law, are a law to themselves,
2 Corinthians 4:2-6
but we have renounced the secret works of shame, not walking in craftiness, nor adulterating the word of God; but, by the manifestation of the truth, commending ourselves to every man's conscience in the sight of God.
Hebrews 4:12-13
For the word of God is living and powerful, and sharper than any two edged sword, and pierces even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
1 John 3:19-21
And by this we know that we are of the truth; and we shall have our hearts at rest before him: