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The historical sense involves a perception, not only of the pastness of the past, but of its presence.

Every project is a new challenge, a new opportunity to learn.

When we are planning for posterity， we ought to remember that virtue is not hereditary.

勇氣并不總是咆哮。有時候，勇氣是一天結束時那個輕聲說"明天我再試一次"的聲音。

在量子力學的領域里，觀察者成為實驗的一部分，僅僅通過觀察的行為就改變了結果。