Don't let anyone tell you what you can't do.

The best way to predict the future is to create it.

学习数学的唯一方法就是做数学。

A liberdade é um bem que não tem preço.

The stranger is an element of the group itself, not unlike the poor and sundry 'inner enemies'—an element whose membership within the group involves both being outside it and confronting it.

Habit is habit, and not to be flung out of the window by any man, but coaxed downstairs a step at a time.