A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.

A first principle not formally recognized by scientific methodologists: when you run into something interesting, drop everything else and study it.

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

Let men be happy, informed, skillful, well behaved, and productive.

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.

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

Old age is rather like another country. You will enjoy it more if you have prepared yourself before you go.