A coldly rationalist individualist can deny that he has any obligation to make sacrifices for the future.

Ecological differentiation is the necessary condition for coexistence.

Fundamentalists are panicked by the apparent disintegration of the family, the disappearance of certainty and the decay of morality. Fear leads them to ask, if we cannot trust the Bible, what can we trust?

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 essence of dramatic tragedy is not unhappiness. It resides in the solemnity of the remorseless working of things.

No one should be able to enter a wilderness by mechanical means.

The greatest folly is to accept expert statements uncritically. At the very least, we should always seek another opinion.