礼貌，并不需要花钱。用完马桶后，把马桶盖放下；上电梯时，耐心等别人出来再进去；把购物车放回指定区域；在借东西时，归还时要东西的状态要比你借的时候还要好（例如给车加满油、把物品清理干净）。
Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.
The moment you start to think about style, you're lost.
沉默有时比言语更有力量。
There is no escape from the labyrinth of existence.
A story is a letter that the author writes to himself, to tell himself things that he would be unable to discover otherwise.
数学不是关于数字、方程、计算或算法：它是关于理解的。
听从理性的人会迷失：理性奴役所有心智不够强大无法驾驭它的人。