전도서 3:7의 Musar

There are times when silence is good, as when divine justice strikes against a man, as in the case of Aaron, as it is written, "And Aaron held his peace" (Lev. 10:3). If a person hears people reviling him, he should be silent. And this is a great quality, to be silent in the face of one's revilers. And one should also accustom himself to be silent in the synagogue, for this is modesty and it requires great alertness properly to direct his heart in prayer. And if one is sitting among the wise he should be silent and listen to their words, for when he is silent, he hears what he does not know, but when he speaks he does not add anything to his knowledge. However, if he is doubtful as to the meaning of the words of the wise he should ask them, for to be silent in such a case is very bad: King Solomon said, "A time to keep silence, and a time to speak" (Eccl. 3:7) — there are times when speaking is good and there are times when silence is good. And the wise man said, "When you do not find a man who can teach you morality, then cleave to silence lest you speak folly." And since the tongue is very facile, one must take care to make it heavy, to guard it so that it does not speak. An abundance of words is like a heavy burden, and the weight of many words is more difficult to bear than the weight of much silence. And if a man hears his neighbor speaking he should be silent until he finishes, "He that giveth answer before he heareth, it is folly and confusion unto him" (Prov. 18:13).