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The only limit to our realization of tomorrow is our doubts of today.

History has neither the desire nor the capacity to make men better or worse; it merely records what they have been and what they have done.

The tyranny of a prince in an oligarchy is not so dangerous to the public welfare as the apathy of a citizen in a democracy.

The destiny of man is in his own soul.

Human freedom is bounded by its choices.

科學是提出正確問題的藝術。

Don’t be afraid to ask a question that may sound stupid because 99% of the time everyone else is thinking of the same question and is too embarrassed to ask it.