...not everyone is willing to defend a position of 'not knowing.' There is no virtue in ignorance for its own sake.

The world's a poor standard. any society which is free of hunger and violence looks bright against that background.

The way positive reinforcement is carried out is more important than the amount.

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

A culture must be reasonably stable, but it must also change, and it will presumably be strongest if it can avoid excessive respect for tradition and fear of novelty on the one hand and excessively rapid change on the other.

Unable to understand how or why the person we see behaves as he does, we attribute his behavior to a person we cannot see, whose behavior we cannot explain either but about whom we are not inclined to ask questions.

At this very moment enormous numbers of intelligent men and women of goodwill are trying to build a better world. But problems are born faster than they can be solved.