The place where optimism most flourishes is the lunatic asylum ---Henry Havelock Ellis,British sexologist, physician, and social reformer.

乐观主义最为活跃的地方是 疯人院 ---亨利.哈维洛克.艾利斯，英国性学家，医生和社会改革家。

The man who is a pessimist before forty-eight knows too much; the man who is an optimist after forty-eight knows too little.

未逾四十八岁的观主义者，是知道得太多之人；而年逾四十八岁的乐观主义者，是知道得太少之人。