The mob rushes in where individuals fear to tread.

When we say that a man controls himself, we must specify who is controlling whom.

The human species took a crucial step forward when its vocal musculature came under operant control in the production of speech sounds. Indeed, it is possible that all the distinctive achievements of the species can be traced to that one genetic change.

Overcrowding can be corrected only by inducing people not to crowd, and the environment will continue to deteriorate until polluting practices are abandoned.

Does a poet create, originate, initiate the thing called a poem, or is his behavior merely the product of his genetic and environmental histories?

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

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?