一个人的死亡，与其说是他自己的事，不如说是生者的事。

The mind is an active, dynamic process, not a passive receptacle.

Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.

The way in which men produce their means of subsistence depends first of all on the nature of the actual means they find in existence and have to reproduce.

内心开始更认真生活的人，外在也会活得更简单。