在我们推理关于事实的过程中，有各种可能的确证程度，从最高的确定性到最低级别的道德证据。

We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.

The truth is always elsewhere.

I try to capture the flow of time with gunpowder. 我试图用火药捕捉时间的流动。