The source of his power lay not in his doctrine, but in his temperament, and the rare quality of his wisdom was due less to his reason than to his imagination. Reality eluded him; he had neither diligence nor constancy enough to master and possess it; but his mind was open to all philosophic influences, from whatever quarter they might blow; the lessons of science and the hints of poetry worked themselves out in him to a free and personal religion. He differed from the plodding many, not in knowing things better, but in having more ways of knowing them. His grasp was not particularly firm, he was far from being, like a Plato or an Aristotle, past master in the art and the science of life. But his mind was endowed with unusual plasticity, with unusual spontaneity and liberty of movement—it was a fairyland of thoughts and fancies. He was like a young god making experiments in creation: he blotched the work, and always began again on a new and better plan. Every day he said, "Let there be light," and every day the light was new. His sun, like that of Heraclitus, was different every morning.

What seemed, then, to the more earnest and less critical of his hearers a revelation from above was in truth rather an insurrection from beneath, a shaking loose from convention, a disintegration of the normal categories of reason in favour of various imaginative principles, on which the world might have been built, if it had been built differently. This gift of revolutionary thinking allowed new aspects, hints of wider laws, premonitions of unthought of fundamental unities to spring constantly into view. But such visions were necessarily fleeting, because the human mind had long before settled its grammar, and discovered, after much groping and many defeats, the general forms in which experience will allow itself to be stated. These general forms are the principles of common sense and positive science, no less imaginative in their origin than those notions which we now call transcendental, but grown prosaic, like the metaphors of common speech, by dint of repetition.

Yet authority, even of this rational kind, sat lightly upon Emerson. To reject tradition and think as one might have thought if no man had ever existed before was indeed the aspiration of the Transcendentalists, and although Emerson hardly regarded himself as a member of that school, he largely shared its tendency and passed for its spokesman. Without protesting against tradition, he smilingly eluded it in his thoughts, untamable in their quiet irresponsibility. He fled to his woods or to his "pleached garden," to be the creator of his own worlds in solitude and freedom. No wonder that he brought thence to the tightly conventional minds of his contemporaries a breath as if from paradise. His simplicity in novelty, his profundity, his ingenuous ardour must have seemed to them something heavenly, and they may be excused if they thought they detected inspiration even in his occasional thin paradoxes and guileless whims. They were stifled with conscience and he brought them a breath of Nature; they were surfeited with shallow controversies and he gave them poetic truth.

Imagination, indeed, is his single theme. As a preacher might under every text enforce the same lessons of the gospel, so Emerson traces in every sphere the same spiritual laws of experience—compensation, continuity, the self-expression of the Soul in the forms of Nature and of society, until she finally recognizes herself in her own work and sees its beneficence and beauty. His constant refrain is the omnipotence of imaginative thought; its power first to make the world, then to understand it, and finally to rise above it. All Nature is an embodiment of our native fancy, all history a drama in which the innate possibilities of the spirit are enacted and realized. While the conflict of life and the shocks of experience seem to bring us face to face with an alien and overwhelming power, reflection can humanize and rationalize that power by conceiving its laws; and with this recognition of the rationality of all things comes the sense of their beauty and order. The destruction which Nature seems to prepare for our special hopes is thus seen to be the victory of our impersonal interests. To awaken in us this spiritual insight, an elevation of mind which is at once an act of comprehension and of worship, to substitute it for lower passions and more servile forms of intelligence—that is Emerson's constant effort. All his resources of illustration, observation, and rhetoric are used to deepen and clarify this sort of wisdom.

Such thought is essentially the same that is found in the German romantic or idealistic philosophers, with whom Emerson's affinity is remarkable, all the more as he seems to have borrowed little or nothing from their works. The critics of human nature, in the eighteenth century, had shown how much men's ideas depend on their predispositions, on the character of their senses and the habits of their intelligence. Seizing upon this thought and exaggerating it, the romantic philosophers attributed to the spirit of man the omnipotence which had belonged to God, and felt that in this way they were reasserting the supremacy of mind over matter and establishing it upon a safe and rational basis.

The Germans were great system-makers, and Emerson cannot rival them in the sustained effort of thought by which they sought to reinterpret every sphere of being according to their chosen principles. But he surpassed them in an instinctive sense of what he was doing. He never represented his poetry as science, nor countenanced the formation of a new sect that should nurse the sense of a private and mysterious illumination, and relight the fagots of passion and prejudice. He never tried to seek out and defend the universal implications of his ideas, and never wrote the book he had once planned on the law of compensation, foreseeing, we may well believe, the sophistries in which he would have been directly involved. He fortunately preferred a fresh statement on a fresh subject. A suggestion once given, the spirit once aroused to speculation, a glimpse once gained of some ideal harmony, he chose to descend again to common sense and to touch the earth for a moment before another flight. The faculty of idealization was itself what he valued. Philosophy for him was rather a moral energy flowering into sprightliness of thought than a body of serious and defensible doctrines. In practising transcendental speculation only in this poetic and sporadic fashion, Emerson retained its true value and avoided its greatest danger. He secured the freedom and fertility of his thought and did not allow one conception of law or one hint of harmony to sterilize the mind and prevent the subsequent birth within it of other ideas, no less just and imposing than their predecessors. For we are not dealing at all in such a philosophy with matters of fact or with such verifiable truths as exclude their opposites. We are dealing only with imagination, with the art of conception, and with the various forms in which reflection, like a poet, may compose and recompose human experience.

A certain disquiet mingled, however, in the minds of Emerson's contemporaries with the admiration they felt for his purity and genius. They saw that he had forsaken the doctrines of the Church; and they were not sure whether he held quite unequivocally any doctrine whatever. We may not all of us share the concern for orthodoxy which usually caused this puzzled alarm: we may understand that it was not Emerson's vocation to be definite and dogmatic in religion any more than in philosophy. Yet that disquiet will not, even for us, wholly disappear. It is produced by a defect which naturally accompanies imagination in all but the greatest minds. I mean disorganization. Emerson not only conceived things in new ways, but he seemed to think the new ways might cancel and supersede the old. His imagination was to invalidate the understanding. That inspiration which should come to fulfil seemed too often to come to destroy. If he was able so constantly to stimulate us to fresh thoughts, was it not because he demolished the labour of long ages of reflection? Was not the startling effect of much of his writing due to its contradiction to tradition and to common sense?

So long as he is a poet and in the enjoyment of his poetic license, we can blame this play of mind only by a misunderstanding. It is possible to think otherwise than as common sense thinks; there are other categories beside those of science. When we employ them we enlarge our lives. We add to the world of fact any number of worlds of the imagination in which human nature and the eternal relations of ideas may be nobly expressed. So far our imaginative fertility is only a benefit: it surrounds us with the congenial and necessary radiation of art and religion. It manifests our moral vitality in the bosom of Nature.

But sometimes imagination invades the sphere of understanding and seems to discredit its indispensable work. Common sense, we are allowed to infer, is a shallow affair: true insight changes all that. When so applied, poetic activity is not an unmixed good. It loosens our hold on fact and confuses our intelligence, so that we forget that intelligence has itself every prerogative of imagination, and has besides the sanction of practical validity. We are made to believe that since the understanding is something human and conditioned, something which might have been different, as the senses might have been different, and which we may yet, so to speak, get behind—therefore the understanding ought to be abandoned. We long for higher faculties, neglecting those we have, we yearn for intuition, closing our eyes upon experience. We become mystical.

Mysticism, as we have said, is the surrender of a category of thought because we divine its relativity. As every new category, however, must share this reproach, the mystic is obliged in the end to give them all up, the poetic and moral categories no less than the physical, so that the end of his purification is the atrophy of his whole nature, the emptying of his whole heart and mind to make room, as he thinks, for God. By attacking the authority of the understanding as the organon of knowledge, by substituting itself for it as the herald of a deeper truth, the imagination thus prepares its own destruction. For if the understanding is rejected because it cannot grasp the absolute, the imagination and all its works—art, dogma, worship—must presently be rejected for the same reason. Common sense and poetry must both go by the board, and conscience must follow after: for all these are human and relative. Mysticism will be satisfied only with the absolute, and as the absolute, by its very definition, is not representable by any specific faculty, it must be approached through the abandonment of all. The lights of life must be extinguished that the light of the absolute may shine, and the possession of everything in general must be secured by the surrender of everything in particular.