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Never stop learning, because the world never stops changing.

——《在滬舉辦茶話會上的演說》（1916年7月17日）

To understand mathematics is to speak the language of the universe.

"The best stories are those that touch the heart and the mind at the same time."

To succeed, planning alone is insufficient. One must improvise as well.

"Experience is simply the name we give our mistakes."

Nobody wants to be this strenuous thing: an individual; it demands an effort.

The most dangerous lies are the ones we believe about ourselves.