You cannot get through a single day without having an impact on the world around you. What you do makes a difference, and you have to decide what kind of difference you want to make.

I have always believed that the way to make money is to buy when everyone else is selling and to sell when everyone else is buying.

I want to make a difference in the world.

数学不是一项观赏性运动；要理解它，必须积极参与其中。