句子使用了隐喻手法，将两者关系比作“试金石”，结构对称，表达精炼且富有哲理。
Humor and seriousness serve as each other's touchstone. If one refuses to accept a well-intentioned joke, there must be suspicion in their heart; conversely, a joke that cannot withstand scrutiny is certainly devoid of wisdom. — Gorky
We often say: I want the prize money for doing this task more than I want to actually perform the task. This is because I can immediately voice my thoughts without resorting to any cunning tricks. — Hegel
The root of humor is not joy, but sorrow; there is no humor in heaven. — Mark Twain
People possess different talents. Some are naturally humorous, while others are not. Those who lack a sense of humor are best advised not to force it. — Lao She
Humor is an inherent part of human nature. It may be able to change the atmosphere for a moment, but it cannot alter the pain of a lifetime. — Guo Chen
Using jokes to deal with enemies is certainly a good strategy, but the joke must strike at the opponent's vital weakness. Otherwise, the joke remains merely a joke, nothing more. — Lu Xun
幽默与严肃互为试金石。若一个人不愿接受善意的玩笑，其心中必有疑虑；而那些经不起推敲的玩笑，往往也缺乏真正的智慧。——高尔克亚
我们常说：比起实际去做这件事，我更想要得到这笔奖金。因为这样我不仅能立即表达出自己的想法，而且无需耍弄任何诡计。——黑格尔
幽默的内在根源并非欢乐，而是悲哀；天堂里是没有幽默的。——马克·吐温
人的天赋各不相同，有人擅长幽默，有人则不然。对于不擅长幽默的人而言，最好不要勉强为之。——老舍
幽默是人的一种本性。它或许能暂时改变当下的氛围，却无力化解一生的痛苦。——郭辰
用玩笑来应对敌人，固然也是一种战术，但必须击中对手的致命弱点，否则，玩笑终究只是一场毫无意义的嬉戏罢了。——鲁迅
"We are often so busy that we forget to feel and enjoy life."
"Life is like a song; if you always sing on a high note, you will eventually wear out your voice."
"Work hard, but there is no need to strive to exhaustion."
"Joy needs sorrow as its companion, and after the rain, the sky should clear."
"Work seriously, live easily."