No pessimist ever discovered the secrets of the stars, or sailed to an uncharted land, or opened a new heaven to the human spirit.

No pessimist ever discovered the secrets of the stars, or sailed to an uncharted land, or opened a new heaven to the human spirit.

没有悲观主义者曾发现过星星的秘密，或航行到一个未知的地方，或为人类的精神打开一个新的天堂。

-- Helen Keller 海伦·凯勒