错误的事实对科学进步极为有害,因为它们常常长久存在。
The only limit to our realization of tomorrow is our doubts of today.
Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph.
真相很少是纯粹的,也从来不是简单的。