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I have never been able to write a happy play. I can't. I can write a funny play, but not a happy play.

My life has no script; everything is improvisation.

I don’t make music for the critics. I make it for the people who feel it.

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

大學不是實現特定目的或產生特定結果的機器；它是一種人類活動的方式。