Proverbs 27:19
Just as water reflects the face, so the heart reflects the person.
Genesis 6:5
The LORD saw that human evil was growing more and more throughout the earth, with every inclination of people's thoughts becoming only evil on a continuous basis.
Psalm 33:15
He formed the hearts of them all; he understands everything they do.
Mark 7:21
because it's from within, from the human heart, that evil thoughts come, as well as sexual immorality, stealing, murder,
James 1:22-25
Keep on being obedient to the word, and not merely being hearers who deceive themselves.