Jeremiah 17:9

“The heart is deceitful above all things, etc.] This is the source of the idolatry and creature confidence of the Jews, sins which were the cause of their ruin; and though what is here said is particularly applicable to their hearts, yet is in general true of the heart of every man; which is “deceitful”, and deceiving; and puts a cheat upon the man himself whose it is: it deceives him with respect to sin; it proposes it to him under the notion of pleasure; it promises him a great deal in it, but does not yield a real pleasure to him; it is all fancy and imagination; a mere illusion and a dream; and what it gives is very short lived; it is but for a season, and ends in bitterness and death: or…”

“deceitful--from a root, "supplanting," "tripping up insidiously by the heel," from which Jacob (Hos 12:3) took his name. In speaking of the Jews' deceit of heart, he appropriately uses a term alluding to their forefather, whose deceit, but not whose faith, they followed. His "supplanting" was in order to obtain Jehovah's blessing. They plant Jehovah for "trust in man" (Jer 17:5), and then think to deceive God, as if it could escape His notice, that it is in man, not in Him, they trust. desperately wicked--"incurable" [HORSLEY], (Mic 1:9). Trust in one's own heart is as foolish as in our fellow man (Pro 28:26).”

“In the rest of the prophecy Jeremiah dwells upon the moral faults which had led to Judah’s ruin. Jeremiah 17:6 Like the heath - Or, “like a destitute man” Psalms 102:17. The verbs “he shall see” (or fear) and “shall inhabit” plainly show that a man is here meant and not a plant. Jeremiah 17:8 The river - Or, “water-course” Isaiah 30:25, made for purposes of irrigation. Shall not see - Or, “shall not fear Jeremiah 17:6.” God’s people feel trouble as much as other people, but they do not fear it because they know (1) that it is for their good, and (2) that God will give them strength to bear it. Jeremiah 17:9 The train of thought is apparently this: If the man is so blessed Jeremiah 17:7-8 who…”

“The heart - There is nothing so false and deceitful as the heart of man; deceitful in its apprehensions of things, in the hopes and promises which it nourishes, in the assurances that it gives us; unsearchable by others, deceitful with reference to ourselves, and abominably wicked, so that neither can a man know his own heart, nor can any other know that of his neighbour's. Jeremiah 17:11”

“17:9-10 By nature, the human heart is deceitful and desperately wicked. Only the Lord really knows how bad it is.”

“Jer 16:12; Gen 6:5, Gen 8:21; Job 15:14-16; Psa 51:5, Psa 53:1-3; Pro 28:26; Ecc 9:3; Mat 15:19; Mar 7:21, Mar 7:22; Heb 3:12; Jam 1:14, Jam 1:15 Jeremiah 17:10”