THE CHILDREN’S GOLDEN LIBRARY: THE HOUND OF THE BASKERVILLES

You see,’ he explained, ‘ I consider that a man’s brain originally is like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him is crowded out, or at best is jumbled up with a lot of other things so that he has a difficulty in laving his hands upon it. Now the skilful workman is careful about what he takes in to his brain-attic.’