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.

The existence of any pure race with special endowments is a myth, as is the belief that there are races all of whose members are foredoomed to eternal inferiority.

The historical development of the work of anthropologists seems to single out clearly a domain of knowledge that heretofore has not been treated by any other science

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

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.

The disease of mutual distrust among nations is the bane of modern civilization

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