Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it. When we enquire into any subject, the first thing we have to do is to know what books have treated of it. This leads us to look at catalogues, and at the backs of books in libraries.
To talk in public, to think in solitude, to read and to hear, to enquire and answer enquiries, is the business of a scholar. He wanders about the world without pomp or terror, and is neither known nor valued but by men like himself.