Jack of all trades is of no trade. 万事皆通，一无所长。
Jest with an ass and he will flap you in the face with his tail. 你跟驴子开玩笑，将被驴尾打耳光。
Joy and sorrow are next-door neighbours. 是喜是忧难以分。
Joy often comes after sorrow, like morning after night. 暮去必将朝至，苦尽常会甜来。
Joy put heart into a man. 人逢喜事精神爽。
Joy shared with others are more enjoyed. 与人同乐，其乐无穷。
Jadge not a book by its cover. 人不可貌相。
Judge not according to the appearance. 不要以貌取人。
Judge not of men and things at first sight. 审人论事宜谨慎，一见之下莫断定。
Justice has long arms. 天网恢恢，疏而不漏。