The heart is deceitful above all things, and desperately wicked: who can know it?
Jeremiah 17:9
King James Version (public domain)
Traditionally attributed to Jeremiah · c. 7th–6th century BC · Major prophet of Judah
Context
7Blessed is the man that trusteth in the LORD, and whose hope the LORD is.
8For he shall be as a tree planted by the waters, and that spreadeth out her roots by the river, and shall not see when heat cometh, but her leaf shall be green; and shall not be careful in the year of drought, neither shall cease from yielding fruit.
9The heart is deceitful above all things, and desperately wicked: who can know it?
10I 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.
11As the partridge sitteth on eggs, and hatcheth them not; so he that getteth riches, and not by right, shall leave them in the midst of his days, and at his end shall be a fool.