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

The growth of financial capitalism made possible a centralization of world economic control and use of this power for the direct benefit of financiers and the indirect injury of all other economic groups.

After years of work in both areas of study, I concluded that the social sciences were different, in many important ways, from the natural sciences, but that the same scientific methods were applicable in both areas, and, indeed, that no very useful work could be done in either area except by scientific methods.

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.

It is this power structure which the Radical Right in the United States has been attacking for years in the belief that they are attacking the Communists.

To know is not too demanding: it merely requires memory and time. But to understand is quite a different matter: it requires intellectual ability and training, a self conscious awareness of what one is doing, experience in techniques of analysis and synthesis, and above all, perspective.

A civilization is complicated, in the first place, because it is dynamic; that is, it is constantly changing in the passage of time, until it has perished.