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

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

A person who has been punished is not thereby simply less inclined to behave in a given way; at best, he learns how to avoid punishment.

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

We do not choose survival as a value, it chooses us.

A piece of music is an experience to be taken by itself.

We shouldn't teach great books; we should teach a love of reading.