To think is of itself to be useful; it is always and in all cases a striving toward God.

In the course of history, men come to see that iron necessity is neither iron nor necessary.

If we find life out there, and it's not us, we will deem it not intelligent. But what may be equally as likely is that we find life that's vastly more intelligent than we are. If that's the case, we are putty in their hands.

Literature is strewn with the wreckage of men who have minded beyond reason the opinions of others.

Some of the best ideas I get seem to happen when I'm doing mindless manual labor or exercise. I'm not sure how that happens, but it leaves me free for remarkable ideas to occur.