Charles H. Spurgeon on Psalms 129:6

Let them be as the grass upon the housetops, which withereth afore it groweth up. Grass on the housetop is soon up and soon down. It sprouts in the heat, finds enough nutriment to send up a green blade, and then it dies away before it reaches maturity, because it has neither earth nor moisture sufficient for its proper development. Before it grows up it dies; it needs not to be plucked up, for it hastens to decay of itself. Such is and such ought to be the lot of the enemies of God's people. Transient is their prosperity; speedy is their destruction. The height of their position, as it hastens their progress, so it hurries their doom. Had they been lower in station they had perhaps been longer in being. "Soon ripe, soon rotten", is an old proverb. Soon plotting and soon rotting, is a version of the old adage which will suit in this place. We have seen grass on the rustic thatch of our own country cottages which will serve for an illustration almost as well as that which comes up so readily on the flat roofs and domes of eastern habitations. The idea is —they make speed to success, and equal speed to failure. Persecutors are all sound and fury, flash and flame; but they speedily vanish —more speedily than is common to men. Grass in the field withers, but not so speedily as grass on the housetops. Without a mower the tufts of verdure perish from the roofs, and so do opposers pass away by other deaths than fall to the common lot of men; they are gone, and none is the worse. If they are missed at all, their absence is never regretted. Grass on the housetop is a nonentity in the world: the house is not impoverished when the last blade is dried up: and, even so, the opposers of Christ pass away, and none lament them. One of the fathers said of the apostate emperor Julian, "That little cloud will soon be gone"; and so it was. Every sceptical system of philosophy has much the same history; and the like may be said of each heresy. Poor, rootless things, they are and are not: they come and go, even though no one rises against them. Evil carries the seeds of dissolution within itself. So let it be.