It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation.

It was the mark of a barbarian to destroy something one could not understand.

The numbers of distinct human societies or nations, when our race is twice its present age, may be far greater than the total number of all the men who have ever lived up to the present time.

In fact, one of the arguments for searching for intelligent life in space, elsewhere, is that we have no evidence that intelligence has any survival value. The most successful creatures on this planet are the cockroaches. They've been around, what is it, 100 million years or so and I suspect they'll still be there 100 million years in the future. Maybe intelligence is an evolutionary aberration which dooms its possessors in the way armor may have doomed some of the dinosaurs.

It was one thing to have guessed it, another to have had that guess confirmed beyond possibility of refutation.

As his body became more and more defenseless, so his means of offense became steadily more frightful.

Few artists thrive in solitude and nothing is more stimulating than the conflict of minds with similar interests.