He that answereth a matter before he heareth it, it is folly and shame unto him. He that answereth a matter before he heareth (it) - i:e., before he understandeth what the other hath said. So 'hear' means understand, Deuteronomy 28:49.
It (is) folly and shame unto him - (Sir 11:8 , 'Answer not before thou hast heard the cause, neither interrupt men in the midst of their talk.') Self-seeking and self-importance are generally the cause of such interruptions.