Proverbs 26:3-7

A whip for the horse, a bridle for the donkey, And a rod for the backs of fools [who refuse to learn]. Do not answer [nor pretend to agree with the frivolous comments of] a [closed-minded] fool according to his folly, Otherwise you, even you, will be like him. Answer [and correct the erroneous concepts of] a fool according to his folly, Otherwise he will be wise in his own eyes [if he thinks you agree with him]. [Matt 16:1-4; 21:24-27] He who sends a message by the hand of a fool Cuts off his own feet (sabotages himself) and drinks the violence [it brings on himself as a consequence]. [Prov 13:17] Like the legs which are useless to the lame, So is a proverb in the mouth of a fool [who cannot learn from its wisdom].