知识只有在它有助于人类解放时才有价值。

时间是最好的老师，但不幸的是，它杀死了所有的学生。

It is much easier to change how you think by changing your behavior， than it is to change your behavior by changing how you think. Act out the change you seek.

No testimony is sufficient to establish a miracle unless the testimony be of such a kind that its falsehood would be more miraculous than the fact which it endeavors to establish.