I. Concerning the disappointment and vexation those will certainly meet with who depend upon creatures for success and relief when they are in trouble (v. 5, 6): Cursed be the man that trusts in man. God pronounces him cursed for the affront he thereby puts upon him. Or, Cursed (that is, miserable) is the man that does so, for he leans upon a broken reed, which will not only fail him, but will run into his hand and pierce it. Observe, 1. The sin here condemned; it is trusting in man, putting that confidence in the wisdom and power, the kindness and faithfulness, of men, which should be placed in those attributes of God only, making our applications to men and raising our expectations from them as principal agents, whereas they are but instruments in the hand of Providence. It is making flesh the arm we stay upon, the arm we work with and with which we hope to work our point, the arm under which we shelter ourselves and on which we depend for protection. God is his people's arm, Isa. xxxii. 2. We must not think to make any creature to be that to us which God has undertaken to be. Man is called flesh, to show the folly of those that make him their confidence; he is flesh, weak and feeble as flesh without bones or sinews, that has no strength at all in it; he is inactive as flesh without spirit, which is a dead thing; he is mortal and dying as flesh, which soon putrefies and corrupts, and is continually wasting. Nay, he is false and sinful, and has lost his integrity; so his being flesh signifies, Gen. vi. 3. The great malignity there is in this sin; it is the departure of the evil heart of unbelief from the living God. Those that trust in man perhaps draw nigh to God with their mouth and honour him with their lips, they call him their hope and say that they trust in him, but really their heart departs from him; they distrust him, despise him, and decline a correspondence with him. Cleaving to the cistern is leaving the fountain, and is resented accordingly. 3. The fatal consequences of this sin. He that puts a confidence in man puts a cheat upon himself; for (v. 6) he shall be like the heath in the desert, a sorry shrub, the product of barren ground, sapless, useless, and worthless; his comforts shall all fail him and his hopes be blasted; he shall wither, be dejected in himself and trampled on by all about him. When good comes he shall not see it, he shall not share in it; when the times mend they shall not mend with him, but he shall inhabit the parched places in the wilderness; his expectation shall be continually frustrated; when others have a harvest he shall have none. Those that trust to their own righteousness and strength, and think they can do well enough without the merit and grace of Christ, thus make flesh their arm, and their souls cannot prosper in graces or comforts; they can neither produce the fruits of acceptable services to God nor reap the fruits of saving blessings from him; they dwell in a dry land.