任何挑战中最难的部分是迈出第一步。

The first fruit of this imagination - and the first lesson of the social science that embodies it - is the idea that the individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.

数学的美在于它让我们以一种既精确又深刻的方式看待世界，揭示支配万物的潜在秩序。

I'm not perfect, and I don't pretend to be.