最重要的是永远不要停止提问。

Change is not made without inconvenience, even from worse to better.

Our descendants will achieve thins that will amaze us, yet a portion of what they will create could have been made with today’s materials and tools if we had had the imagination. Think bigger.

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt, and the profoundest wisdom to know when it ought to be resisted, and when it be obeyed.