Nobody, I suppose, could devote many years to the study of chemical kinetics without being deeply conscious of the fascination of time and change: this is something that goes outside science into poetry; but science, subject to the rigid necessity of always seeking closer approximations to the truth, itself contains many poetical elements.
Nobel Lectures, Chemistry 1942-1962 - Nobel lecture for award received in 1956 - Chemical Kinetics in the Past Few Decades (p. 474), Elsevier Publishing Company. Amsterdam, Netherlands. 1964