我有时候会想，上帝在造人时，似乎高估了她自己的能力。
数学的美在于它能够以最优雅和简洁的方式描述宇宙。
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.
"The past is a ghost that haunts the present, whether we acknowledge it or not."