不要悲观，悲观的面孔会给周围环境带来黯淡。

Don't show pessimistic outlook which will make your surrounding dark.

youdao

千万不要悲观。

Never give in to pessimism.

youdao

不要悲观地认为自己很不幸，其实比你更不幸的人还很多；

Don't think their pessimistic, unfortunately, in fact, still a lot of people who are more unfortunate than you;

youdao

Better to have not had any of it, better to have not been born at all, say the pessimists, than to have this combination package of life followed by death.

最好还是什么都不要有，最好是根本就别出生，悲观主义者如是说，以免有生后即是死这样一个组合。

耶鲁公开课 - 死亡课程节选