The mind is a place of its own which in itself can make a heaven of hell, a hell of heaven.
The soundest investments are those that grow trees and opportunities together.
我父亲总是教导我:关心和分享。这就是我们举办公开课的原因。我唯一能做的就是尝试回馈。
The beauty of mathematics lies in its ability to describe the fundamental laws of nature with precision and elegance.