世界的历史是少数人的历史。
无论你是身居闹市却无人问津的贫民，还是在深山都不得清静的有钱人；亲朋之间的关系往往也建立在利益之上，趋利避害是人之常情，人情冷暖、世态炎凉才是人生常态，不是每一个普通人都能达到无私高尚的境界。
The most valuable thing you can make is a mistake—you can't learn anything from being perfect.
The essence of mathematics lies in its freedom.
You can’t build a reputation on what you are going to do.