The opening of Introduction
Scepticism is as much the result of knowledge, as knowledge is of scepticism. To be content with what we at present know, is, for the most part, to shut our ears against conviction; since, from the very gradual character of our education, we must continually forget, and emancipate ourselves from, knowledge previously acquired; we must set aside old notions and embrace fresh ones; and, as we learn, we must be daily unlearning something which it has cost us no small labour and anxiety to acquire.
And this difficulty attaches itself more closely to an age in which progress has gained a strong ascendency over prejudice, and in which persons and things are, day by day, finding their real level, in lieu of their conventional value. The same principles which have swept away traditional abuses, and which are making rapid havoc among the revenues of sinecurists, and stripping the thin, tawdry veil from attractive superstitions, are working as actively in literature as in society.