(1.) We are here told negatively what is not the fast that God has chosen, and which does not amount to the afflicting of the soul. [1.] It is not enough to look demure, to put on a grave and melancholy aspect, to bow down the head like a bulrush that is withered and broken: as the hypocrites, that were of a sad countenance, and disfigured their faces, that they might appear unto men to fast, Matt. vi. 16. Hanging down the head did indeed well enough become the publican, whose heart was truly humbled and broken for sin, and who therefore, in token of that, would not so much as lift up his eyes to heaven (Luke xviii. 13); but when it was only mimicked, as here, it was justly ridiculed: it is but hanging down the head like a bulrush, which nobody regards or takes any notice of. As the hypocrite's humiliations are but like the hanging down of a bulrush, so his elevations in his hopes are but like the flourishing of a bulrush (Job viii. 11, 12), which, while it is yet in its greenness, withers before any other herb. [2.] It is not enough to do penance, to mortify the body a little, while the body of sin is untouched. It is not enough for a man to spread sackcloth and ashes under him, which may indeed give him some uneasiness for the present, but will soon be forgotten when he returns to stretch himself upon his beds of ivory, Amos vi. 4. Wilt thou call this a fast? No, it is but the shadow and carcase of a fast. Wilt thou call this an acceptable day to the Lord? No, it is so far from being so that the hypocrisy of it is an abomination to him. Note, The shows of religion, though they show ever so fair in the eye of the world, will not be accepted of God without the substance of it.