Kathir bin Murrah said: Do not mention falsehood to the wise (intelligent), they will begin to hate you; and do not speak words of wisdom to the foolish (ignorant), they will belie you. Do not conceal knowledge from those who are worthy of it, otherwise you will be sinful; and do not teach knowledge to those who are unworthy, they will consider you ignorant. Your knowledge has a right over you just as your wealth has a right over you.