The great cataract of nonsense

Good philosophy must exist, if for no other reason, because bad philosophy needs to be answered. The cool intellect must work not only against cool intellect on the other side, but against the muddy heathen mysticisms which deny intellect altogether. Most of all, perhaps we need intimate knowledge of the past. Not that the past has any magic about it, but because we cannot study the future, and yet need something to set against the present, to remind us that the basic assumptions have been quite different in different periods and that much which seems certain to the uneducated is merely temporary fashion. A man who has lived in many place is not likely to be deceived by the local errors of his native village: the scholar has lived in many times and is therefore in some degree immune form the great cataract of nonsense that pours from the press and the microphone of his own age.

—C. S. Lewis, “Learning in War-Time”