Matthew 15:19
For out of the heart proceed evil reasonings, murders, fornications, adulteries, thefts, false testimonies, blasphemies.
Acts 8:22
Therefore repent of this thy wickedness, and pray the Lord, if perchance the thought of thy heart shall be forgiven thee;
Matthew 5:28
But I say unto you that every one looking on a woman in order to lust after her hath already committed adultery with her in his heart.
Matthew 9:4
And Jesus seeing their thoughts said, Why do you think evil in your hearts?
2 Corinthians 10:5
casting down imaginations, and every high thing that exalts itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;