We have penetrated far less deeply into the regularities obtaining within the realm of living things, but deeply enough nevertheless to sense at least the rule of fixed necessity ..... what is still lacking here is a grasp of the connections of profound generality, but not a knowledge of order itself.
When the number of factors coming into play in a phenomenological complex is too large scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible. Neverthess, no one doubts that we are confronted with a causal connection whose causal components are in the main known to us. Occurrences in this domain are beyond the reach of exact perdiction because of the variety of factors in operation, not because of any lack of order in nature.
Scientific American, April 1950
I believe that whoever tries to think things through honestly will soon recognize how unworthy and even fatal is the traditional bias against Negroes. What can the man of good will do to combat this deeply rooted prejudice He must have the courage to set an example by words and deed, and must watch lest his children become influenced by racial bias.