As long as we go back often to Nature herself, and practice the art of then forgetting for the time the fictions and hypotheses necessary in the partial treatments of our specialities,—as long as we thereby allow Nature and her facts to speak to us for themselves,—so long shall we, after each fresh contact, return to our labors with renewed strength and clarified vision.

"Science and Reality" (1931) Bios Vol. 2, No. 1, p. 40