The prime lesson the social sciences can learn from the natural sciences is just this: that it is necessary to press on to find the positive conditions under which desired events take place, and that these can be just as scientifically investigated as can instances of negative correlation. This problem is beyond relativity.

In a day of footloose movements of people and of mixed marriages in the ancestry of the most desirable elements of the community we preach unabashed the gospel of the pure race.

Society in its full sense . . . is never an entity separable from the individuals who compose it.

In world history, those who have helped to build the same culture are not necessarily of one race, and those of the same race have not all participated in one culture.

... oh, I long to prove myself by writing! The best seems to die in me when I give it up. It is the self I love--not this efficient, philanthropic self.

Man is not committed in detail by his biological constitution to any particular variety of behavior.

Racism remains in the eyes of history ... merely another instance of the persecution of minorities for the advantage of those in power.