自由是通过实践养成的习惯。
La libertad es un hábito que se adquiere ejerciéndola.
The purpose of mental activity is successful living.
过程就是目的。
You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.
In mathematics, the journey is often more important than the destination.