He is happy that thinks himself so. 

自乐者常乐。 

An apple a day keeps the doctor away. 

每天一只苹果, 无需医生进门。 

Better wear out shoes than sheets. 

宁愿把鞋子穿漏, 不愿把床单磨破。 

Health is not valued till sickness es. 

病时方知健康可贵。 

Leave off with an appetite. 

吃得七分饱, 就该离餐桌。 

He who has good health is young, and he is rich who owes nothing. 

健康葆青春, 无债即富足。 

Laugh and the world laughs with you, weep and you weep alone. 

欢笑, 则世界与你同乐; 哭泣, 则独自悲伤。 

Blessed is the person who is too busy to worry in the daytime, and too sleepy to worry at night. 

白天忙得没有时间发愁, 夜里困得来不及发愁的人是真正幸福的。 

Happy is he who only desires what he may and does what he ought. 

不作非分之想又能尽本分的人是快乐的。 

There is no greater grief than to recall a time of happiness when in misery.

没有比在悲惨中回忆幸福的时刻更痛苦。