Remember that in every single case in history the process of adaptation has been one of exceeding slowness. Do not look for the impossible, but do not let your path deviate from the quiet and steadfast insistence on full opportunities for your powers.

It is clear, from these considerations, that the three methods of classifying mankind-that according to physical characters, according to language, and according to culture-all reflect the historical development of races from different standpoints; and that the results of the three classifications are not comparable, because the historical facts do not affect the three classes of phenomena equally. A consideration of all these classes of facts is needed when we endeavour to reconstruct the early history of the races of mankind.

We all know scientists who in private life do not come up to the standard of truthfulness, but who, nevertheless, would not consciously falsify the results of their researches

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

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

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

In France, that let down the barriers more than a hundred years ago, the feeling of antipathy is still strong enough to sustain an anti-Jewish political party