On Earth, we are unmanned by our longing for a pastoral past that never really existed; and that, if it had existed, could never exist again...on the Moon, there is no past to long for or dream about. There is no direction but forward.

Knowledge is indivisible. When people grow wise in one direction, they are sure to make it easier for themselves to grow wise in other directions as well. On the other hand, when they split up knowledge, concentrate on their own field, and scorn and ignore other fields, they grow less wise - even in their own field.

I have written 240 books on a wide variety of topics. . . . Some of it I based on education I received in my school, but most of it was backed by other ways of learning - chiefly in the books I obtained in the public library.

It is no defense of superstition and pseudoscience to say that it brings solace and comfort to people. . . . If solace and comfort are how we judge the worth of something, then consider that tobacco brings solace and comfort to smokers; alcohol brings it to drinkers; drugs of all kinds bring it to addicts; the fall of cards and the run of horses bring it to gamblers; cruelty and violence bring it to sociopaths. Judge by solace and comfort only and there is no behavior we ought to interfere with.

In life, unlike chess, the game continues after checkmate.

Plate glass... has no beauty of its own. Ideally, you ought not to be able to see it at all, but through it you can see all that is happening outside. That is the equivalent of writing that is plain and unadorned. Ideally, in reading such writing, you are not even aware that you are reading. Ideas and events seem merely to flow from the mind of the writer into that of the reader without any barrier between. I hope that is what is happening when you read this book

Any book worth banning is a book worth reading.