Society does not need more children; but it does need more loved children. Quite literally, we cannot afford unloved children - but we pay heavily for them every day. There should not be the slightest communal concern when a woman elects to destroy the life of her thousandth-of-an-ounce embryo. But all society should rise up in alarm when it hears that a baby that is not wanted is about to be born.

Ecological differentiation is the necessary condition for coexistence.

You cannot do only one thing.

Why are ecologists and environmentalists so feared and hated? This is because in part what they have to say is new to the general public, and the new is always alarming.

The three filters [against folly] operate through these particular questions: Literacy: What are the words? Numeracy: What are the numbers? Ecolacy: And then what?

A finite world can support only a finite population; therefore, population growth must eventually equal zero.

We see only what we have names for.