- It has generally been assumed that of two opposing systems of philosophy, e. g., realism and idealism, one only can be true and one must be false; and so philosophers have been hopelessly divided on the question, which is the true one.
- In: The Journal of Philosophy, Vol. 7, (1910), p. 407
- Liberalism, on the other hand, regards life as an adventure in which we must take risks in new situations, in which there is no guarantee that the new will always be the good or the true, in which progress is a precarious achievement rather than inevitability.
- In: The Faith of a Liberal', (1946), p. 438
- Unlike the physicist, the psychologist … investigates processes that belong to the same order—perception, learning, thinking—as those by which he conducts his investigation.
- Reason and Nature (1953), p. 81
- In regard to the terrors as well as the superstitions and immoralities of religion, it will not do to urge that they are due only to the imperfections of the men who professed the various religions. If religion cannot restrain evil, it cannot claim effective power for good.