We are easily shocked by crimes which appear at once in their full magnitude. But the gradual growth of our own wickedness, endeared by interest, and palliated by all the artifices of self-deceit, gives us time to form distinctions in our own favor, and reason by degrees submits to absurdity, as the eye is in time accommodated to darkness.

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.