To do great things is difficult，but to command great things is more difficult.

任正非内部讲话稿

Most people are afraid of change, but if you look at it like it's something that can always count on, then it can be a comfort．It doesn't have many things that you can count on．

Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.

意识是生存的工具。