《老子》四十六章有言:‘祸莫大于不知足,咎莫大于欲得,故知足常足矣。’这就是成语‘知足常乐’的来历。知足者,知道满足之谓也;常乐者经常快乐之谓也。‘知足’能够‘常乐’,然而,‘不知足’确实也是一种快乐,而且在工作、 “I” forty-sixth chapter there is a saying: ’Moxibugu greater than I do not know enough, to blame Mu greater than Desire, so contentment often enough. This is the idiom ’contentment’ of the origin. Contentment who know that the satisfaction of that; often happy music often also said. ’Contentment’ can be ’fun’, however, ’not content enough’ is indeed a pleasure, but also at work,