God: a gaseous vertebrate.

Medical science has made such tremendous progress that there is hardly a healthy human left.

A whole population of strangers inhabited and shaped that little body, lived in that mind and controlled its wishes, dictated its thoughts...The name was an abstraction, a title arbitrarily given, like "France" or "England," to a collection, never long the same, of many individuals who were born, lived, and died within him, as the inhabitants of a country appear and disappear, but keep alive in their passage the identity of the nation to which they belong.

If we evolved a race of Isaac Newtons, that would not be progress. For the price Newton had to pay for being a supreme intellect was that he was incapable of friendship, love, fatherhood, and many other desirable things. As a man he was a failure; as a monster he was superb.

The worst enemy of life, freedom and the common decencies is total anarchy; their second worst enemy is total efficiency.

Most of one's life is one prolonged effort to prevent oneself thinking.

I know the outer world as well as you do, and I judge it. You know nothing of my inner world, and yet you presume to judge that world.