Matthew 15:19
For out of the heart come evil thoughts, murder, adultery, fornications, theft, false witness, slander.
Acts 8:22
Repent therefore of this wickedness of yours, and pray to the Lord that, if possible, the intent of your heart may be forgiven you.
Matthew 5:28
But I say to you that every one who looks at a woman lustfully has already committed adultery with her in his heart.
Matthew 9:4
But Jesus, knowing their thoughts, said, "Why do you think evil in your hearts?
2 Corinthians 10:5
We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ,