The one thing that you have that nobody else has is you. Your voice, your mind, your story, your vision. So write and draw and build and play and dance and live as only you can.

La poesía es el eco de la melodía del universo en el corazón de los humanos.

States are rational actors, and they will always act in their own self-interest.

Our frustration is greater when we have much and want more than when we have nothing and want some. We are less dissatisfied when we lack many things than when we seem to lack but one thing.

我们不仅仅是信息的被动接受者；我们积极地构建我们对世界的理解。

学习数学的唯一方法就是做数学。