We are one species. We are starstuff.

You mean am I for it or against it? You think this is a key question I'm going to be asked on Vega, and you want to make sure I give the right answer? Okay. Overpopulation is why I'm in favor of homosexuality and a celibate clergy. A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.

It seems madness to say, 'We're worried that they're going to become addicted to marijuana' -- there's no evidence whatever that it's an addictive drug, but even if it were, these people are dying, what are we saving them from?

All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value.

When you look more generally at life on Earth, you find that it is all the same kind of life. There are not many different kinds; there's only one kind. It uses about fifty fundamental biological building blocks, organic molecules.

Any faith that admires truth, that strives to know God, must be brave enough to accommodate the universe.

A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.