"The dead are always with us, and we are always with them."
真正的喜悦精神、崇高感、超越人类的感觉,这是最高卓越的试金石,在数学中肯定能找到,就像在诗歌中一样。
"The only way to do great work is to love what you do."
Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen.   
每本书都是一次旅程,每次旅程都是一本书。