Jeremiah 17:9-10 (KJV) 9 The heart is deceitful above all things, and desperately wicked: who can know it?" 10 I the Lord search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings." Matthew 15:19 (KJV). "For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:"