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John Gill
Though thou shouldest bray a fool in a mortar among wheat with a pestle,.... As the manna was, Numbers 11:8; and as wheat beat and bruised in a mortar, or ground in a mill, retains its own nature; so, let a wicked man be used ever so roughly or severely, by words, admonitions, reproofs, and counsels; or by deeds, by corrections and punishment, by hard words or blows, whether publicly or...
Matthew Henry
1 Boast not thyself of to morrow; for thou knowest not what a day may bring forth. Here is, 1. A good caution against presuming upon time to come: Boast not thyself, no, not of to-morrow, much less of many days or years to come. This does not forbid preparing for to-morrow, but presuming upon to-morrow. We must not promise ourselves the continuance of our lives and comforts till to-morrow, but...
Charles H. Spurgeon
Though thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his foolishness depart from him. No troubles, no afflictions, can of themselves make a fool into a wise man. The sinner remains a sinner, after all providential chastisements, unless sovereign grace interposes.