Cross reference
Proverbs 27:19
19 Like face looking at face in water, so are the hearts of men to one another.
James 1:22-25
22 But be doers of the word, and not only hearers of it, blinding yourselves with false ideas.
23 Because if any man is a hearer of the word and not a doer, he is like a man looking at his natural face in a glass;
24 For after looking at himself he goes away, and in a short time he has no memory of what he was like.
25 But he who goes on looking into the true law which makes him free, being not a hearer without memory but a doer putting it into effect, this man will have a blessing on his acts.
Genesis 6:5
5 And the Lord saw that the sin of man was great on the earth, and that all the thoughts of his heart were evil.
Psalms 33:15
15 He makes all their hearts; their works are clear to him.
Mark 7:21
21 Because from inside, from the heart of men, come evil thoughts and unclean pleasures,