The past is a foreign country; they do things differently there.

Loneliness is the starting point of thought.

Not for the sake of our health, though it's often presented that way, but because it's an escape from the human anthill. It's an escape from our own competition, and our own dramas. And that's why ween joy looking at glaciers and oceans, and contemplating the Earth from outside its perimeters, etc. We like to feel in contact with something that is non-human, and that is so deeply important to us.

数学不知道种族或地理边界；对于数学来说，文化世界是一个国家。

Hope is not a feeling; it is a doable thing.