It's nice to look back on your life and see things as lessons, and not regrets.

I was so ashamed of who I was, a kind of semi-racist, which didn't make sense.

My stepmother sold my birth certificate and someone asked why I didn't buy it back. I don't know, really. I just couldn't bring myself to do it. It was mine. It cost me nothing and suddenly I had to buy it back.

I have deeply regretted that I did not proceed far enough at least to understand something of the great leading principles of mathematics, for men thus endowed seem to have an extra sense.

Happiness is pleasure without regret.

My father was a management genius. But what I really wanted was a dad.