The thoughts which are occasionally called forth in the progress, are such as could only be produced by an imagination in the highest degree fervid and active, to which materials were supplied by incessant study and unlimited curiosity. The heat of Milton's mind may be said to sublimate his learning, to throw off into his work the spirit of science, unmingled with its grosser parts.
He had considered creation, in its whole extent, and his descriptions are, therefore, learned. He had accustomed his imagination to unrestrained indulgence, and his conceptions, therefore, were extensive. The characteristick quality of his poem is sublimity. He sometimes descends to the elegant, but his element is the great. He can occasionally invest himself with grace; but his natural port is gigantick loftiness[60]. He can please, when pleasure is required; but it is his peculiar power to astonish.
He seems to have been well acquainted with his own genius, and to know what it was that nature had bestowed upon him more bountifully than upon others; the power of displaying the vast, illuminating the splendid, enforcing the awful, darkening the gloomy, and aggravating the dreadful; he, therefore, chose a subject on which too much could not be said, on which he might tire his fancy, without the censure of extravagance.
The appearances of nature, and the occurrences of life, did not satiate his appetite of greatness. To paint things as they are requires a minute attention, and employs the memory rather than the fancy. Milton's delight was to sport in the wide regions of possibility; reality was a scene too narrow for his mind. He sent his faculties out upon discovery, into worlds where only imagination can travel, and delighted to form new modes of existence, and furnish sentiment and action to superiour beings, to trace the counsels of hell, or accompany the choirs of heaven.
But he could not be always in other worlds; he must sometimes revisit earth, and tell of things visible and known. When he cannot raise wonder by the sublimity of his mind, he gives delight by its fertility.
Whatever be his subject, he never fails to fill the imagination. But his images and descriptions of the scenes, or operations of nature, do not seem to be always copied from original form, nor to have the freshness, raciness, and energy of immediate observation. He saw nature, as Dryden expresses it, "through the spectacles of books;" and, on most occasions, calls learning to his assistance. The garden of Eden brings to his mind the vale of Enna, where Proserpine was gathering flowers. Satan makes his way through fighting elements, like Argo between the Cyanean rocks, or Ulysses between the two Sicilian whirlpools, when he shunned Charybdis on the "larboard." The mythological allusions have been justly censured, as not being always used with notice of their vanity; but they contribute variety to the narration, and produce an alternate exercise of the memory and the fancy.
His similes are less numerous, and more various, than those of his predecessors. But he does not confine himself within the limits of rigorous comparison; his great excellence is amplitude; and he expands the adventitious image beyond the dimensions which the occasion required. Thus comparing the shield of Satan to the orb of the moon, he crowds the imagination with the discovery of the telescope, and all the wonders which the telescope discovers.
Of his moral sentiments it is hardly praise to affirm that they excel those of all other poets; for this superiority he was indebted to his acquaintance with the sacred writings. The ancient epick poets, wanting the light of revelation, were very unskilful teachers of virtue: their principal characters may be great, but they are not amiable. The reader may rise from their works with a greater degree of active or passive fortitude, and sometimes of prudence; but he will be able to carry away few precepts of justice, and none of mercy.
From the Italian writers it appears, that the advantages of even Christian knowledge may be possessed in vain. Ariosto's pravity is generally known; and, though the Deliverance of Jerusalem may be considered as a sacred subject, the poet has been very sparing of moral instruction.
In Milton every line breathes sanctity of thought, and purity of manners, except when the train of the narration requires the introduction of the rebellious spirits; and even they are compelled to acknowledge their subjection to God, in such a manner as excites reverence, and confirms piety.