Science cannot be stopped. Man will gather knowledge no matter what the consequences – and we cannot predict what they will be. Science will go on — whether we are pessimistic, or are optimistic, as I am. I know that great, interesting, and valuable discoveries can be made and will be made… But I know also that still more interesting discoveries will be made that I have not the imagination to describe — and I am awaiting them, full of curiosity and enthusiasm.

Lecture at Yale University, "Chemical Achievement and Hope for the Future." (October 1947) Published in Science in Progress. Sixth Series. Ed. George A. Baitsell. 100-21, (1949)