These are the two contrasts which puzzle us at first in Milton, and which distinguish him from other poets in our remembrance afterwards. We have a superficial complexity in illustration and imagery and metaphor; and in contrast with it we observe a latent simplicity of idea, an almost rude strength of conception. The underlying thoughts are few, though the flowers on the surface are so many. We have likewise the perpetual contrast of the soft poetry of the memory, and the firm--as it were, fused--and glowing poetry of the imagination. His words, we may half fancifully say, are like his character: there is the same austerity in the real essence, the same exquisiteness of sense, the same delicacy of form which we know that he had, the same music which we imagine there was in his voice. In both his character and his poetry there was an ascetic nature in a sheath of beauty. No book, perhaps, which has ever been written is more difficult to criticize than "Paradise Lost." The only way to criticize a work of the imagination is, to describe its effect upon the mind of the reader,--at any rate, of the critic; and this can only be adequately delineated by strong illustrations, apt similes, and perhaps a little exaggeration. The task is in its very nature not an easy one: the poet paints a picture on the fancy of the critic, and the critic has in some sort to copy it on the paper; he must say what it is before he can make remarks upon it. But in the case of "Paradise Lost" we hardly like to use illustrations. The subject is one which the imagination rather shrinks from. At any rate, it requires courage and an effort to compel the mind to view such a subject as distinctly and vividly as it views other subjects. Another peculiarity of "Paradise Lost" makes the difficulty even greater. It does not profess to be a mere work of art; or rather, it claims to be by no means that and that only. It starts with a dogmatic aim: it avowedly intends to "assert eternal Providence, And justify the ways of God to men."