We are not compelled in naturalism, or even in materialism, to ignore immaterial things; the point is that any immaterial things which are recognized shall be regarded as names, aspects, functions, or concomitant products of those physical things among which action goes on.
ATTRIBUTION:
George Santayana (18631952), U.S. philosopher, essayist. Originally published 1936. Deweys Naturalistic Metaphysics, repr. In Philosophy in the Twentieth Century, vol. 1, Random House (1962).