In conclusion: though it be but one and the same Power that prescribes the form and determines the truth of all Ideas, there is yet an essential difference between the two classes of ideas to which we have referred; for it may well be doubted whether any Primary Idea can ever be fully realized by a finite mind,--at least in the present state. Take, for instance, the idea of beauty. In its highest form, as presented to the consciousness, we still find it referring to something beyond and above itself, as if it were but an approximation to a still higher form. The truth of this, we think, will be particularly felt by the artist, whether poet or painter, whose mind may be supposed, from his natural bias, to be more peculiarly capable of its highest developement; and what true artist was ever satisfied with any idea of beauty of which he is conscious? From this approximated form, however, he doubtless derives a high degree of pleasure, nay, one of the purest of which his nature is capable; yet still is the pleasure modified, if we may so express it, by an undefined yearning for what he feels can never be realized. And wherefore this craving, but for the archetype of that which called it forth?--When we say not satisfied, we do not mean discontented, but simply not in full fruition. And it is better that it should be so, since one of the happiest elements of our nature is that which continually impels it towards the indefinite and unattainable. So far as we know, the like limits may be set to every other primary idea,--as if the Creator had reserved to himself alone the possible contemplation of the archetypes of his universe.
With regard to the other class, that of Secondary Ideas, which we have called the reflex product of the mind, their distinguishing characteristic is, that they not only admit of a perfect realization, but also of outward manifestation, so as to be communicated to others. All works of imagination, so called, present examples of this. Hence they may also be termed imitative or imaginative. For, though they draw their assimilants from the actual world, and are likewise regulated by the unknown Power before mentioned, yet are they but the forms of what, _as a whole_, have no actual existence;--they are nevertheless true to the mind, and are made so by the same Power which affirms their possibility. This species of Truth we shall hereafter have occasion to distinguish as Poetic Truth.