The essence of mathematics lies in its freedom.

The soil is not just dirt—it's the foundation of civilization.

I have learnt how to live... how to be in the world and of the world, and not just to stand aside and watch.

We are here to add what we can you to life，not to get what we can from it.

创新不是让事情变得更复杂，而是让事情变得更简单可靠。