Proverbs 4:23

4:23 Guard your heart with all vigilance,

for from it are the sources of life.

Jeremiah 17:10

17:10 I, the Lord, probe into people’s minds.

I examine people’s hearts.

I deal with each person according to how he has behaved.

I give them what they deserve based on what they have done.

Matthew 15:19

15:19 For out of the heart come evil ideas, murder, adultery, sexual immorality, theft, false testimony, slander.

Mark 7:21-22

7:21 For from within, out of the human heart, come evil ideas, sexual immorality, theft, murder, 7:22 adultery, greed, evil, deceit, debauchery, envy, slander, pride, and folly.

Romans 7:8-9

7:8 But sin, seizing the opportunity through the commandment, produced in me all kinds of wrong desires. For apart from the law, sin is dead. 7:9 And I was once alive apart from the law, but with the coming of the commandment sin became alive

James 4:5

4:5 Or do you think the scripture means nothing when it says, “The spirit that God caused to live within us has an envious yearning”?