质量从来不是偶然的；它始终是智慧努力的结果。

人生苦短，何必在意别人的看法。

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

在数学中，提出问题的艺术必须比解决问题更有价值。

The act of writing is an act of optimism. You wouldn't take the trouble to do it if you felt it didn't matter.

To me, painting is not about color at all; I’m interested in the quality of light.