'We shall never know much while we have so many books.'

Such was my thought, many years ago; and such does all my observation and experience still confirm. Knowledges we may have, even if we do read much: but not much knowledge.

But, some will ask, if one has true ideas, though derived from others—is not that knowledge? Yes, if he has ideas: but propositions expressing them are not enough: one may have many of these, and know but little. For example, let us suppose Locke right about the mind's coming into existence as a sheet of white paper—a man may receive this, and yet not know it. See how easily this may be tested. White paper will receive any impression you please: can the human mind receive the impression that two and two are five, or that a part is equal to the whole? Locke could have answered this, and seemed to save his theory. The borrower from Locke cannot.