世界悬于一线，那根线就是人的心灵。

Human beings are not born once and for all on the day their mothers give birth to them, but life obliges them over and over again to give birth to themselves.

数学语言是普遍的，超越了文化和语言的障碍。

我从十五岁开始致力于学习，三十岁便能自立于社会了，四十岁对各种事理不再迷惑不解，五十岁懂得了自然界的规律，六十岁对听到的事情能领会贯通，并能辨别是非真伪，七十岁时做事能随心所欲，但又不会超出礼法的规范。