I'm not gonna be one of those people who has to look back and say, 'I should have done that.'

We must remember that we are not the only species that matters on this planet.

The most advanced machinery means nothing without skilled hands to guide it.

Commit to your business. Believe in it more than anybody else. I think I overcame every single one of my personal shortcomings by the sheer passion I brought to my work.

We leave behind something of ourselves wherever we have been.

The most important thing in mathematics is to have a good intuition.

要读得好，必须成为一个发明家。既有创造性的阅读，也有创造性的写作。

The only limit is the one you set yourself.

Psychology must be purely experimental and analytical.

I'm not in competition with anybody but myself. My goal is to beat my last performance.