The heart is perverse above all things, and unsearchable, who can know it?

“For this reason [it is, said], "Who shall declare His generation?" since "He is a man, and who shall recognise Him?" But he to whom the Father which is in heaven has revealed Him, knows Him, so that he understands that He who "was not born either by the will of the flesh, or by the will of man," is the Son of man, this is Christ, the Son of the living God. For I have shown from the Scriptures, that no one of the sons of Adam is as to everything, and absolutely, called God, or named Lord. But that He is Himself in His own right, beyond all men who ever lived, God, and Lord, and King Eternal, and the Incarnate Word, proclaimed by all the prophets, the apostles, and by the Spirit Himself, may be seen by all who have attained to even a small portion of the truth. Now, the Scriptures would not have testified these things of Him, if, like others, He had been a mere man. But that He had, beyond all others, in Himself that pre-eminent birth which is from the Most High Father, and also experienced that pre-eminent generation which is from the Virgin, the divine Scriptures do in both respects testify of Him: also, that He was a man without comeliness, and liable to suffering; that He sat upon the foal of an ass; that He received for drink, vinegar and gall; that He was despised among the people, and humbled Himself even to death and that He is the holy Lord, the Wonderful, the Counsellor, the Beautiful in appearance, and the Mighty God, coming on the clouds as the Judge of all men;—all these things did the Scriptures prophesy of Him.”

“David also said in the forty-fourth psalm, "Your throne, O God, is forever and ever. The scepter of your kingdom is a scepter of uprightness. You have loved righteousness. You have hated wickedness. Therefore God, your God, has anointed you with the oil of gladness." By this word he also shows his name, since (as I have shown above) he has called Christ from his anointing. Then, that he was also man, Jeremiah teaches, saying, "And he is a man, and who shall know him?" Also Isaiah: "And God shall send to them a man who shall save them, shall save them by judging."”

“The apostle says, "For God, sending his own Son in the likeness of sinful flesh, and for sin condemned sin in the flesh, that the righteousness of the law might be fulfilled in us." He does not say "in the likeness of flesh," for Christ took on himself the reality, not the likeness, of flesh. Nor does he say in the likeness of sin, for he did not sin but was made sin for us. Yet he came "in the likeness of sinful flesh." That is, he took on him the likeness of sinful flesh, the likeness, because it is written, "He is man, and who shall know him?" He was man in the flesh, according to his human nature that he might be recognized, but in power he was above humanity, that he might not be recognized, so he has our flesh but has not the failings of this flesh.”

“The inquirer, then, might say that the prophet says only that Christ is God, without any reference to his human nature. Yet, in our apostolic doctrine, Christ is not only God in whom we may safely trust but also the mediator between God and humankind—the man Jesus. The prophet explains this in the words in which he seems to check himself, and to supply the omission: "The heart," he says "is inscrutable above all things, and he is man, and who shall know him?" He is man in order that, in the form of a servant, he might heal the hard in heart and that they might acknowledge as God him who became man for their sakes, that their trust might be not in humankind, but in God—man.”

“Here the obstinacy of the people is shown explicitly, which is the cause of their reprobation: hence first he shows their obstinate malice; second, the consummated punishment, ch. 19: Thus says the Lord, etc. In the first, two parts. In the first, the causes of the obstinacy are set down; second, the obstinacy itself is proved through experience, ch. 18: The word that was made to Jeremiah from the Lord. The first into two. In the first he sets down the causes of the obstinacy, in the second he calls them back to the worship of their former religion, there: Thus says the Lord, etc. Concerning the first, two parts. First he touches on one cause, namely the affection of iniquity, setting down the fault, in which he sets down the example: the sin of Judah, of the two tribes, is written — that is, so deeply impressed upon their affection, especially of idolatry — as a writing that is made with an iron stylus, upon the nail, that is, upon the adamant, which is a stone polished after the manner of a nail. Zach. 7: They set their heart as an adamant, lest they should hear the law, and the words which the Lord of hosts sent in his holy spirit by the hand of the former prophets. Or, sin, that is, the sentence for the sin. And he expounds the affection of the sin: engraved, that is, driven deep, upon the breadth, that is, upon the heart dilated in the affection of sin: hence the heart thus dilated stands in the place of the adamant, and the horns of the altars, that is, of the idols, stand in the place of the iron stylus. For God had commanded that four horns should go forth from the altar, on which the grating should hang, Exod. 27; and they had made the like on the altars of the idols. Hosea 8: Ephraim has multiplied altars to himself for sinning, altars have become to him unto sin. He also sets down a sign of this affection in the succession of offspring: when their children shall have remembered, retaining it in affection, in the diversity of place, of the altars which were built in the cities. Above, ch. 2: Under every leafy tree you lay prostrate, a harlot. And joining to it the punishment, namely the plundering of the goods which pertain to the necessity of life: your strength, that is, the goods in which you thought yourself to be strong, like sand, like camps. Above, ch. 15: Your riches, and treasures I will give up to plunder freely, in all your sins, and in all your borders. That is, when your malice shall have been so consummated that the children imitate the fathers, worshipping idols in all places, then I will give your strength, and all your treasures, up to plunder. And of the goods which pertain to the worship of idolatry: your high places, in which they worshipped idols. Ezek. 6: Behold I will bring a sword upon you, and I will destroy your high places, and I will demolish your altars, and your idols shall be broken, and I will cast down your slain before your idols. He also threatens captivity: you shall be left, O Jerusalem, from your inheritance, from the people subject to you. Or, O nation, from the land, while you shall go into captivity. Lam. 1: How does the city sit solitary that was full of people? She has become as a widow, the mistress of the nations; the princess of the provinces has become tributary. He threatens servitude too: and I will make you serve your enemies. Deut. 28: You shall serve your enemy, whom the Lord will send upon you, in hunger, and thirst, and nakedness, and in want of all things; and he will put an iron yoke upon your neck, until he consume you. And touching the proximate cause of the punishment, namely the divine wrath, which is the will to punish: because you have kindled a fire. Deut. 32: A fire is kindled in my fury, and shall burn even to the lowest depths of hell. Second, he touches on another cause, namely the confidence of impunity: cursed is the man who trusts in man. Now they promised themselves impunity on three grounds. First, from the power of their friends, namely the Egyptians: and this he removes first. Second, from the abundance of riches, and this, there: the partridge has hatched what she did not lay. Third, from disbelief in the divine threats; and this, there: behold they say to me, where is the word of the Lord? Concerning the first, two parts. First he sets down the distinction between those who trust in the Lord and in men; second he introduces the author of this distinction, there: the heart of man is perverse. Concerning the first, two parts. First is set down the curse of those who trust in human help, where he sets down the curse: cursed — as if given over to evil. And he sets down flesh as the arm, that is, strength; in which is set down the unreasonableness of the hope, because by flesh human frailty is signified. And he departs from the Lord; in which is shown the reason for the curse: for it is permitted to trust in man under God, but not so that God be forsaken. And this is said on account of the Jews, who, God being despised, placed their hope in the Egyptians. Isa. 31: Woe to them that go down into Egypt for help, trusting in horses, and putting their confidence in chariots, because they are many, and in horsemen, because they are very strong; and they have not trusted in the Holy One of Israel, and have not sought after the Lord. Ps. 145: Trust not in princes, in the sons of men, in whom there is no salvation. And he sets down a comparison for the curse: for he shall be like the tamarisk, which is held vile. Symmachus: like a fruitless tree in the wilderness. He shall not see: because before the deliverance from captivity, almost all had died. But he shall dwell; in which is shown the horror of the place of captivity — not that it was evil in itself, but to those who were oppressed in servitude — in drought, in the desert, which is not cultivated, but is of dry air, which makes the trees unfruitful; salt land, as to the dryness of the earth, from the parching of moisture by the sun. Ps. 106: He has turned rivers into a wilderness, and the springs of waters into thirst. Second is set down the blessing of those who trust in the divine help. And first he sets down the blessing: blessed is the man who trusts in the Lord, and the Lord shall be his confidence — namely, that in whatever he trusts, the reason for trusting is God. Ps. 2: When his wrath shall be kindled in a short time, blessed are all they that trust in him. Isa. 30: Blessed are all they that wait for him. Second he sets down a comparison taken from a tree — first as to the firmness of the roots: and he shall be like a tree, in which is figured the firmness of divine protection. Ps. 1: And he shall be like a tree which is planted near the running waters, which shall bring forth its fruit in due season. Second, as to the greenness of the leaves: and his leaf shall be — in which is signified temporal prosperity, and spiritual verdure. Prov. 11: The just shall spring up like a green leaf. Third, as to the abundance of the fruits, in which is signified the plenty of good works: nor shall it ever cease to bear fruit. Apoc. 21: yielding its fruit every month. And because the Jews could say that a distinction of rewards could not be made on account of the diversity of thoughts, therefore he consequently introduces the author of this distinction. And first he poses the question: it is perverse, that is, entangled with many evils. Prov. 20: As deep water, so is counsel in the heart of a man; but a wise man will draw it out. Second he sets down the response: and he sets down two things which make the distinction of judgment sufficient: namely knowledge: I the Lord searching the hearts — as to thoughts — and the reins — as to the affections. Rom. 8: He who searches the hearts knows what the Spirit desires, because he asks according to God for the saints. And justice: who give to each according to his way — as to the disposition of the heart — and his fruit — as to the outward work. Isa. 3: Say to the just man that it is well, for he shall eat the fruit of his devices.”

“The heart is deceitful above all things,.... 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 it proposes it under the notion of profit; it promises him riches, by such and such sinful ways it suggests; but, when he has got them, he is the loser by them; these deceitful riches choke the word, cause him to err from the faith, pierce him through with many sorrows, and endanger the loss of his soul: it promises honour and preferment in the world, but promotes him to shame; it promises him liberty, but brings him into bondage; it promises him impunity, peace, and security, when sudden destruction comes: it deceives him in point of knowledge; it persuades him that he is a very knowing person, when he is blind and ignorant, and knows nothing as he ought to know; and only deceives himself; for there is no true knowledge but of God in Christ, and of a crucified Christ, and salvation by him; see Co1 3:18 it deceives in the business of religion; it makes a man believe that he is a very holy and righteous man, and in a fair way for heaven, when he is far from that, and the character it gives him; in order to this, it suggests to him that concupiscence or lust, or the inward workings of the mind, are not sin; and it is only on this principle that it can be accounted for, that Saul, before conversion, or any other man, should be led into such a mistake, as to conclude that, touching the righteousness of the law, he was blameless: it represents other sins as mere peccadillos, as little sins, and not to be regarded; and even puts the name of virtue on vices; profuseness and prodigality it calls liberality, and doing public good; and covetousness has the name of frugality and good economy: it directs men to compare themselves and their outward conduct with others, that are very profane and dissolute; and from thence to form a good character of themselves, as better than others; and as it buoys up with the purity of human nature, so with the power of man's freewill to do that which is good, and particularly to repent at pleasure; and it puts the profane sinner upon trusting to the absolute mercy of God, and hides from him his justice and holiness; and it puts others upon depending upon the outward acts of religion, or upon speculative notions, to the neglect of real godliness; see Jam 1:22. The man of a deceitful heart, the hypocrite, tries to deceive God himself, but he cannot; he oftentimes deceives men, and always himself; so do the profane sinner, the self-righteous man, and the false teacher; who attempts to deceive the very elect, but cannot; yea, a good man may be deceived by his own heart, of which Peter is a sad instance, Mat 26:33. The heart is deceitful to a very great degree, it is superlatively so; "above all", above all creatures; the serpent and the fox are noted for their subtlety, and wicked men are compared to them for it; but these comparisons fall short of expressing the wicked subtlety and deceit in men's hearts; yea, it is more deceitful to a man than the devil, the great deceiver himself; because it is nearer to a man, and can come at him, and work upon him, when Satan cannot: or "about", or "concerning all things" (q); it is so in everything in which it is concerned, natural, civil, or religious, and especially the latter. The Septuagint version renders it "deep"; it is an abyss, a bottomless one; there is no fathoming of it; the depths of sin are in it; see Psa 64:6 and, seeing it is so deceitful, it should not be trusted in; a man should neither trust in his own heart, nor in another's, Pro 28:26, "and desperately wicked": everything in it is wicked; the thoughts of it are evil; the imaginations of the thoughts are so; even every imagination, and that only, and always, Gen 6:5 the affections are inordinate; the mind and conscience are defiled; the understanding darkened, so dark as to call evil good, and good evil; and the will obstinate and perverse: all manner of sin and wickedness is in it; it is the cage of every unclean bird, and the hold of every foul spirit; all sin is forged and framed in it; and all manner of evil comes out of it, Rev 18:1 yea, it is wickedness itself, Psa 5:9, it is so even to desperation; it is "incurably wicked" (r), as it may be rendered; it is so without the grace of God, and blood of Christ: who can know it? angels do not, Satan cannot; only the spirit of a man can know the things of a man within him; though the natural man does not know the plague of his own heart; the Pharisee and perfectionist do not, or they would not say they were without sin; such rant arises from the ignorance of their own hearts; only a spiritual man knows his own heart, the plague of it, the deceitfulness and wickedness in it; and he does not know it all; God only knows it fully, as is expressed in the next words, which are an answer to the question; see Co1 2:11. (q) "de omnibus", vid. Noldium, p. 548. (r) "et immedicabili malo affectum", Gussetius; "incurabiliter aegrum", Cocceius.”

“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).”