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.

We have not yet seen what man can make of man.

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?

I've often said that my rats have taught me much more than I've taught them.

The strengthening of behavior which results from reinforcement is appropriately called 'conditioning'. In operant conditioning we 'strengthen' an operant in the sense of making a response more probable or, in actual fact, more frequent.

We admire people to the extent that we cannot explain what they do, and the word 'admire' then means 'marvel at.'

A scientist may not be sure of the answer, but he's often sure he can find one. And that's a condition which is clearly not enjoyed by philosophy.