Teachers must learn how to teach ... they need only to be taught more effective ways of teaching.

Better contraceptives will control population only if people will use them. A nuclear holocaust can be prevented only if the conditions under which nations make war can be changed. The environment will continue to deteriorate until pollution practices are abandoned. We need to make vast changes in human behavior.

Must we wait for selection to solve the problems of overpopulation, exhaustion of resources, pollution of the environment and a nuclear holocaust, or can we take explicit steps to make our future more secure? In the latter case, must we not transcend selection?

If the world is to save any part of its resources for the future, it must reduce not only consumption but the number of consumers.

Those who have had anything useful to say have said it far too often, and those who have had nothing to say have been no more reticent.

The real problem is not whether machines think but whether men do.

The world's a poor standard. any society which is free of hunger and violence looks bright against that background.