The greatest of the changes that science has brought is the acuity of change; the greatest novelty the extent of novelty.

Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search.

All history teaches us that these questions that we think the pressing ones will be transmuted before they are answered, that they will be replaced by others, and that the very process of discovery will shatter the concepts that we today use to describe our puzzlement.

It is proper to the role of the scientist that he not merely find new truth and communicate it to his fellows, but that he teach, that he try to bring the most honest and intelligible account of new knowledge to all who will try to learn.

If we must live with a perpetual sense that the world and the men in it are greater than we and too much for us, let it be the measure of our virtue that we know this and seek no comfort.

We knew the world would not be the same.