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.

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.

Was putting a man on the moon actually easier than improving education in our public schools?

If freedom is a requisite for human happiness, then all that’s necessary is to provide the illusion of freedom.

To say that a man is sinful because he sins is to give an operational definition of sin. To say that he sins because he is sinful is to trace his behavior to a supposed inner trait. But whether or not a person engages in the kind of behavior called sinful depends upon circumstances which are not mentioned in either question. The sin assigned as an inner possession (the sin a person "knows") is to be found in a history of reinforcement.

The evolution of cultures appears to follow the pattern of the evolution of species. The many different forms of culture which arise correspond to the "mutations" of genetic theory. Some forms prove to be effective under prevailing circumstances and others not, and the perpetuation of the culture is determined accordingly.

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