Charles H. Spurgeon on Psalms 107:17

Fools because of their transgression, and because of their iniquities, are afflicted. Many sicknesses are the direct result of foolish acts. Thoughtless and lustful men by drunkenness, gluttony, and the indulgence of their passions fill their bodies with diseases of the worst kind. Sin is at the bottom of all sorrow, but some sorrows are the immediate results of wickedness: men by a course of transgression afflict themselves and are fools for their pains. Worse still, even when they are in affliction they are fools still; and if they were brayed in a mortar among wheat with a pestle, yet would not their folly depart from them. From one transgression they go on to many iniquities, and while under the rod they add sin to sin. Alas, even the Lord's own people sometimes play the fool in this sad manner.