The coin fresh from the mint of thought shows clearly its character and value. Circulation dims its lustre, wears away its substance, and blunts its edge. We pass it from hand to hand, careless of its lessening weight, and not even glancing at its fading image and superscription. Familiarity with a truth is generally in inverse proportion to its comprehension, and in the end there comes a time when men know it so well that they cease to think it.
Susan Blow, A Study of Dante, p. 35.