Happiness is holding someone in your arms and knowing you hold the whole world.

We are all in the gutter, but some of us are looking at the stars.

数学研究是所有智力和精神进步不可或缺的基础。

不要等到别人告诉你准备好了才行动，这个世界或许会说你还不够格。展现自己，放手去做。