Thinking doesn't pay. Just makes you discontented with what you see around you.

There are perhaps 5% of the population that simply can't think. There are another 5% who can, and do. The remaining 90% can think, but don't

Expertise in one field does not carry over into other fields. But experts often think so. The narrower their field of knowledge the more likely they are to think so.

Circumstances can force your hand. So think ahead!

A prude is a person who thinks that his own rules of propriety are natural laws.

I also think there are prices too high to pay to save the United States. Conscription is one of them. Conscription is slavery, and I don't think that any people or nation has a right to save itself at the price of slavery for anyone, no matter what name it is called. We have had the draft for twenty years now; I think this is shameful. If a country can't save itself through the volunteer service of its own free people, then I say: Let the damned thing go down the drain!

What we think of as 'Physical beauty' is almost certainly a tag for a complex of useful survival characteristics. Smartness intelligence among them.

I think perhaps of all the things a police state can do to its citizens, distorting history is possibly the most pernicious.

I think that science fiction has a distinct therapeutic value because all of it has as its primary postulate that the world does change. I cannot overemphasize the importance of that idea.