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量子力學的本質在于它迫使我們放棄經典的因果性理想。

The mind can be considered as a physical symbol system.

The only real love is the love of truth.

鳥快要死的時候，叫聲是悲切的，人快要死的時候，說話是善良的。

"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."

It all depends on how we look at things, and not on how they are themselves.

最難的是理解已經知道的東西。