Literature is a point outside of our hodiernal circle through which a new one may be described. The use of literature is to afford us a platform whence we may command a view of our present life, a purchase by which we may move it. We fill ourselves with ancient learning, install ourselves the best we can in Greek, in Punic, in Roman houses, only that we may wiselier see French, English and American houses and modes of living. In like manner we see literature best from the midst of wild nature, or from the din of affairs, or from a high religion. The field cannot be well seen from within the field. The astronomer must have his diameter of the earth's orbit as a base to find the parallax of any star.