The scientist, by the very nature of his commitment, creates more and more questions, never fewer. Indeed the measure of our intellectual maturity, one philosopher suggests, is our capacity to feel less and less satisfied with our answers to better problems. – G.W. Allport, Becoming, 1955

With acknowledgement of residues, we can be more easily prepared to grant the unit of science, the overlapping of disciplines, and the total coherence of all facts. – Kenneth L. Pike

Science does not know its debt to imagination. – Ralph Waldo Emerson