Of all the flimsy theories in regard to the conditions of poetic creativeness that the mind of man could devise, this is certainly the flimsiest. It is only necessary to give a hasty glance at the works of those poets who are regarded as Masters of Song in the various literatures of the ancient and the modern world, to learn the secret of their vitality and power—that secret being, first, that they all possessed the best knowledge and learning of their times and places; and, secondly, that they all held the widest and most intimate relations with their several ages and countries, and drank deepest of, and most intensely reflected, the spirit of those ages and countries. If Shakespeare was not a learned man, he was the best educated man that ever lived. He had a fulness of life, intellectual and spiritual, and an easy command of all his faculties, to which but few of the sons of men have ever attained; and he lived in an age the most favorable in human history for the exercise of dramatic genius, and an age, on the whole, more civilized than any that had ever preceded it.

No true poet could live in any age without imbibing and reflecting its spirit, and that to a much greater degree than other men. For the poetic nature is distinguished from ordinary natures by its greater impressibility and its keener, more penetrating insight, and to suppose that a poet can keep apart from the spirit of his age and the state of society around him is to lose sight of the very _differentia_ of the poetic nature, and implicitly to admit its feebleness. In one respect he may be said to keep apart from his age, in the sense of rejecting, in having no affinities for, what in it is ephemeral, while appropriating what of vital and eternal is in it. His affinities, by virtue of his poetic nature, are for what is enduring in the transient. And every age must have the vital and eternal in it, as the vital and eternal are omnipresent at all times and in all places.

An Introduction to the Prose and Poetical Works of John Milton — Part 7

The great poet is great because he is intensely _individual_, and there can be no intense individuality, paradoxical as it may appear, that is not subject, in a more than ordinary degree, to impressions of time and place. An individual in the fullest sense of the word, one who legitimates, as it were, in the eyes of his country or his age, his decisive influence over its destiny, is generally characterized, not so much by his rejecting power, though he will always, and necessarily, have this in a high degree, as by his appropriating power. He brings to the special unity of his nature all that that nature, in its healthiest activity, can assimilate, and throws off only the to him non-assimilable dross of things. The more complete his life becomes, the more it is bound up with what surrounds it, and he is susceptible of impressions the more numerous and the more profound.

An Introduction to the Prose and Poetical Works of John Milton — Part 7