Matthew 15:19
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimony, blasphemies.
Acts 8:22
Repent therefore of this thy wickedness, and pray the Lord, if haply the thought of thy heart may be forgiven thee.
Matthew 5:28
But I say to you, that whoever looketh on a woman to lust after her, hath committed adultery with her already in his heart.
Matthew 9:4
And Jesus seeing their thoughts, said, Wherefore have ye evil thoughts in your hearts?
2 Corinthians 10:5
casting down reasonings, and every high thing that exalteth itself against the knowledge of God, and bringing every purpose into captivity to the obedience of Christ,