Matthew 12:34-36
You brood of vipers, how can you speak good when you are evil? For the mouth utters what the heart is full of.
Matthew 15:19
For out of the heart come evil designs, murder, adultery, sexual vice, stealing, false witness, and slander.
Matthew 23:13
Woe to you, you impious scribes and Pharisees! you shut the Realm of heaven in men's faces; you neither enter yourselves, nor will you let those enter who are on the point of entering.
Acts 5:3-4
"Ananias," said Peter, "why has Satan filled your heart and made you cheat the holy Spirit by appropriating some of the money paid for the land?
Acts 8:21-22
You come in for no share or lot in this religion. Your heart is all wrong in the sight of God.
James 1:14-15
Everyone is tempted as he is beguiled and allured by his own desire;
James 1:27
Pure, unsoiled religion in the judgment of God the Father means this: to care for orphans and widows in their trouble, and to keep oneself from the stain of the world.
James 3:5-6
So the tongue is a small member of the body, but it can boast of great exploits. What a forest is set ablaze by a little spark of fire!