When you run into something interesting, drop everything else and study it.

I have to tell people that they are not responsible for their behavior. They're not creating it; they're not initiating anything. It's all found somewhere else. That's an awful lot to relinquish.

If you're old, don't try to change yourself, change your environment.

I don't deny the importance of genetics. However, the fact that I might be altruistic isn't because I have a gene for altruism; the fact that I do something for my children at some cost to myself comes from a history that has operated on me.

If you insist that individual rights are the summum bonum, then the whole structure of society falls down.

You can get along very well in this world by simply coming up with a quantity of reasonably valid statements.