Most of the psychological differences between men and women seem to come from differences in their reproductive system

The problem of the survival of humanity is not a matter of ensuring the birth of future generations but of limiting it. The immediate danger to humanity is that of total annihilation within a generation or two, not the failure of mankind to breed. A woman seeking alternative modes of life is no longer morally bound to pay her debt to nature.

Yes, but nomes aren't hard to make,— said Dorcas. "You just need other nomes." —You're weird.

Then if children make so much trouble, why do people have 'em?

I'm feeling full of tiny princes, bustling to get out into the world and start plotting against one another.

A picture of a complete apple tree, however accurate, is in a certain sense much less like the tree itself than is a little daisy.

What one exorcises in this [imagery] way at little cost, and for the price of a few tears, will never in effect be reproduced

Art, as I see it, is any human activity which doesn't grow out of either of our species' two basic instincts: survival and reproduction.

The turtle lives 'twixt plated decks Which practically conceal its sex. I think it clever of the turtle In such a fix to be so fertile.

Monks, nuns, long-term spinsters and bachelors and permanent homosexuals are all, in a reproductive sense, aberrant. Society has bred them, but they have failed to return the compliment.

The love of posterity is the consequence of the necessity of death. If a man were sure of living forever here, he would not care about his offspring.