The heart is deceitful above all things, and desperately wicked: who can know it?
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Jeremiah 17:7-11
Tyndale Open Study Notes (CC BY-SA 4.0).
17:9-10 By nature, the human heart is deceitful and desperately wicked. Only the Lord really knows how bad it is.
Other Bible passages linked to this one, most cited first.
For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
This is an evil among all things that are done under the sun, that there is one event unto all: yea, also the heart of the sons of men is full of evil, and madness is in their heart while they live, and after that they go to the dead.
He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
And GOD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.