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

There is nothing more dangerous than a shallow thinking compassionate person

Throughout history, human exploitation of the earth has produced this progression: colonize-destroy-move on.

Every plausible policy must be followed by the question 'And then what?'

To say that we mutually agree to coercion is not to say that we are required to enjoy it, or even to pretend we enjoy it.

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.

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