He had seen too much of the cosmos to have any great faith in man's ability to understand it.

Why do people in this age think their own impoverished lives must be the norm of the universe?

The fish that first ventured ashore had considerable practical problems.

I wrote the first book, Harvest of Stars, and as I was writing it, I saw that certain implications had barely been touched on... It's perfectly obvious that two completely revolutionary things are going on, with cybernetics, and biological science.

If we knew exactly what to expect throughout the Solar System, we would have no reason to explore it.

Let us settle down to the serious business of getting drunk.

A fanatic is a man who, when he's lost sight of his purpose, redoubles his effort.