The passion for seeking the truth for truth's sake can be kept alive only if we continue to seek the truth for truth's sake.

There is no fundamental difference in the ways of thinking of primitive and civilized man. A close connection between race and personality has never been established.

It is our task to inquire into the causes that have brought about the observed differentiation, and to investigate the sequence of events that have led to the establishment of the multifarious forms of human life

I object to teaching of slogans intended to befog the mind, of whatever kind they may be

Furthermore, the study of the present surroundings is insufficient: the history of the people, the influence of the regions through which it has passed on its migrations, and the people with whom it came into contact, must be considered

My father had retained an emotional affection for the ceremonial of his parental home, without allowing it to influence his intellectual freedom

If we were to select the most intelligent, imaginative, energetic, and emotionally stable third of mankind, all races would be present.