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動力學(xué)的方程在用變分法的語言表達(dá)時是完全的。

樂觀主義者傾向于將他們的麻煩解釋為暫時的、可控的和特定于一種情況的。另一方面，悲觀主義者認(rèn)為他們的麻煩會永遠(yuǎn)存在，破壞他們所做的一切，并且無法控制。

看見就是忘記所見之物的名字。

I consider myself a poet first and a musician second.

The freedom then of man, and liberty of acting according to his own will, is grounded on his having reason, which is able to instruct him in that law he is to govern himself by, and make him know how far he is left to the freedom of his own will.

Art is the lie that tells the truth.

不把怒氣轉(zhuǎn)移到別人身上，不重復(fù)犯同樣的錯誤。