And thus, in full, there are four classes: the men who feel nothing, and therefore see truly; the men who feel strongly, think weakly, and see untruly (second order of poets); the men who feel strongly, think strongly, and see truly (first order of poets); and the men who, strong as human creatures can be, are yet submitted to influences stronger than they, and see in a sort untruly, because what they see is inconceivably above them. This last is the usual condition of prophetic inspiration.
I separate these classes, in order that their character may be clearly understood; but of course they are united each to the other by imperceptible transitions, and the same mind, according to the influences to which it is subjected, passes at different times into the various states. Still, the difference between the great and less man is, on the whole, chiefly in this point of alterability. That is to say, the one knows too much, and perceives and feels too much of the past and future, and of all things beside and around that which immediately affects him, to be in any wise shaken by it. His mind is made up; his thoughts have an accustomed current; his ways are stedfast; it is not this or that new sight which will at once unbalance him. He is tender to impression at the surface, like a rock with deep moss upon it; but there is too much mass of him to be moved. The smaller man, with the same degree of sensibility, is at once carried off his feet; he wants to do something he did not want to do before; he views all the universe in a new light through his tears; he is gay or enthusiastic, melancholy or passionate, as things come and go to him. Therefore the high creative poet might even be thought, to a great extent, impassive (as shallow people think Dante stern), receiving indeed all feelings to the full, but having a great centre of reflection and knowledge in which he stands serene, and watches the feeling, as it were, from far off.
Dante, in his most intense moods, has entire command of himself, and can look around calmly, at all moments, for the image or the word that will best tell what he sees to the upper or lower world. But Keats and Tennyson, and the poets of the second order, are generally themselves subdued by the feelings under which they write, or, at least, write as choosing to be so; and therefore admit certain expressions and modes of thought which are in some sort diseased or false.