Proverbs 27:3 - Joseph Benson’s Commentary on the Old and New Testaments

A stone is heavy, &c., but a fool's wrath is heavier More grievous and intolerable, as being without cause, without measure, and without end. “Fools and unskilful people,” says Melancthon, “are more apt to be angry than others, because they consider not the infirmity of mankind, and that there are many errors of others which ought to be borne withal, and cured after a gentle manner. For, as goodness is most eminent in God, who himself bears with many evils in us, and commands us to forgive and it shall be forgiven us, so wise men bend their minds to goodness and lenity; remembering the common infirmities of all men, their own as well as others. Nor can there be a more lively picture of the implacable spirit of a fool, than that which our Saviour himself hath drawn in the gospel: of a cruel servant, who, when he had been forgiven sixty tons of gold by his master, would not forgive his fellow-servant a hundred pence, Matthew 18.”