Few scientists would treat their cars as badly as they treat their conceptual schemes.

It is extremely urgent to try and adapt our thoughts realistically to a world which has no fixed general direction either upward or downward, but is likely to vary largely according to what we do.

Evolution is the creation-myth of our age. By telling us our origin it shapes our views of what we are. It influences not just our thought, but our feelings and actions too, in a way which goes far beyond its official function as a biological theory.

Hubris calls for nemesis, and in one form or another it's going to get it, not as a punishment from outside but as the completion of a pattern already started.

The trouble with human beings is not really that they love themselves too much; they ought to love themselves more. The trouble is simply that they don’t love others enough. "The End of Anthropocentrism?

The symbolism of meat-eating is never neutral. To himself, the meat-eater seems to be eating life. To the vegetarian, he seems to be eating death. There is a kind of gestalt-shift between the two positions which makes it hard to change, and hard to raise questions on the matter at all without becoming embattled.

Morally as well as physically, there is only one world, and we all have to live in it