蒸汽机是改善人类状况的最有力工具。

邪恶胜利的唯一必要条件是好人无所作为。

I have a dream, and that dream is worth every sacrifice I make.

The purification of the soul is more important than the purification of the body.

我们今天做出的每一个决定，都在塑造明天的森林。

Failure is interesting—it’s part of making progress. You never learn from success, but you do learn from failure.