失败不是成功的对立面；它是成功的垫脚石。

Success in any scientific career requires an unusual equipment of capacity, industry, and energy.

The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.