Of course, a positive growth rate might be taken as evidence that a population is below its optimum.

Using the commons as a cesspool does not harm the general public under frontier conditions, because there is no public, the same behavior in a metropolis is unbearable.

Ecological differentiation is the necessary condition for coexistence.

It is a mistake to think that we can control the breeding of mankind in the long run by an appeal to conscience.

The only kind of coercion I recommend is mutual coercion, mutually agreed upon by the majority of the people affected.

We see only what we have names for.

What features of your daily life do you expect to be improved by a further increase in population?