In mathematics, the art of proposing a question must be held of higher value than solving it.
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
有没曾阅读过的书,没有不可对人说的事。
大多数人都不是自己。他们的思想是别人的意见,他们的生活是模仿别人的生活,他们的恋爱只是引述。