The tongue of idle persons is never idle.

tongue的用法 ... The tongue of idle persons is never idle. [谚语]人懒嘴不懒。 tie someone's tongue 使某人缄默，封住某人的口 ...

... The tongue of idle persons is never idle. 懒汉的舌头并不闲。 To pay a person in his own way. 以其人之道还治其人之身。 ...