Optimists are usually wrong. But all the great change in history, positive change, was done by optimists.

Optimists are usually wrong. But all the great change in history, positive change, was done by optimists.

乐观主义者通常是错的。但是历史上所有伟大的变革，积极的变革，都是由乐观主义者完成的。

-- Thomas L. Friedman 托马斯·L·弗里德曼