Matthew Henry Commentary Proverbs 26:4-5

"Answer not a fool according to his folly, Lest thou also be like unto him. Answer a fool according to his folly, Lest he be wise in his own conceit." — Proverbs 26:4-5 (ASV)

We are to fit our remarks to the man, and address them to his conscience, so that they may best end the debate.