Matthew 15:19 "For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies.
Acts 5:3-4
But Peter said, "Ananias, why has Satan filled your heart to lie to the Holy Spirit and keep back part of the price of the land for yourself? 4 "While it remained, was it not your own? And after it was sold, was it not in your own control? Why have you conceived this thing in your heart? You have not lied to men but to God."
Genesis 6:5 Then the LORD saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually.
Proverbs 6:14 Perversity is in his heart, He devises evil continually, He sows discord.
Jeremiah 17:9 "The heart is deceitful above all things, And desperately wicked; Who can know it?