The question which is forcing itself more and more on the minds of scientific men is not how many diseases are, but how few are not, the consequences of men's ignorance, barbarism, folly, self-indulgence. The medical man is felt more and more to be necessary in health as he is in sickness, to be the fellow-workman not merely of the clergyman, but of the social reformer, the political economist, and the statesman; and the first object of his science to be prevention, and not cure.

National Sermons. 1851.