Answer not a fool according to his folly, Lest thou also be like unto him.
Answer not a [self-confident] fool according to his folly, lest you also be like him.
Don’t answer fools according to their folly, or you will become like them yourself.
Do not respond to the foolish according to his folly, lest you become like him.
Answer not a fool according to his folly, lest thou be made like him.