In a competitive world of limited resources, total freedom of individual action is intolerable

The only thing we can really count on in this uncertain world is human unreliability itself.

Economists (and others) who are satisfied with nature-free equations develop a dangerous hubris about the potency of our species

Ecology is the overall science of which economics is a minor speciality.

The rational man finds that his share of the cost of the wastes he discharges into the commons is less than the cost of purifying his wastes before releasing them.

The Universal Declaration of Human Rights describes the family as the natural and fundamental unit of society. It follows that any choice and decision with regard to the size of the family must irrevocably rest with the family itself, and cannot be made by anyone else.

Value is a relative concept: the value of each action is determined by comparing it with other possible actions.