To this day the Arab influence is evident in southern Italy, northern Africa and, above all, in Spain.

For years I have told my students that I been trying to train executives rather than clerks. The distinction between the two is parallel to the distinction previously made between understanding and knowledge. It is a mighty low executive who cannot hire several people with command of more knowledge than he has himself.

When we approach history, we are dealing with a conglomeration of irrational continua. Those who deal with history by nonrational processes are the ones who make history, the actors in it.

The social sciences are usually concerned with groups of persons rather than individual persons. The behavior of individuals, being free, is unpredictable.

Thus, the use of fiat money is more justifiable in financing a depression than in financing a war.

It is not easy to tear any event out of the context of the universe in which it occurred without detaching from it some factor that influenced it.

The basis of social relationships is reciprocity: if you cooperate with others, others will cooperate with you.