It remains to consider the poem of Lucretius as a work of literary art and genius. Much indeed of what may be said on the subject of his genius has necessarily been anticipated in the chapters devoted to the consideration of his personal characteristics, his speculative philosophy, and his moral teaching. The 'multa lumina ingenii' are most conspicuous in those passages of his poem which best illustrate the range and distinctness of his observation, the grandeur and truth of his philosophical conceptions, the passionate sympathy with which he strove to elevate and purify human life. But, at the same time, the most manifest defects of the poem, considered as a work of art, spring from the same source as its greatness considered as a work of genius, viz. the diversity and conflicting aims of the faculties employed on its production. Although, perhaps, from a Roman point of view, the practical purpose which reduces the mass of miscellaneous details to unity, and the success with which he encounters the difficulties both of matter and language, might entitle the poem to be regarded as a work 'multae artis,' yet, when tested by the canons either of Greek or of modern taste, it fails in the most essential conditions of art,—the choice of subject and the form of construction. The title of the poem is indeed taken from a Greek model, the poem of Empedocles, 'περὶ φύσεως': and the form of a personal address to Memmius, in which Lucretius has embodied his teaching, was suggested by the personal address of the older poet to the 'son of Anchytus.' But although Aristotle acknowledges the poetical genius of Empedocles by applying to him the epithet Ὁμηρικός, he denies to his composition the title of a poem. The work of Empedocles and the kindred works of Xenophanes and Parmenides are inspired not by the passion of art but by the enthusiasm of discovery. They are to be regarded rather as philosophical rhapsodies than as purely didactic poems, like either the 'Works and Days' of Hesiod or the writings of the Alexandrine School. They were written in hexameter verse partly because that was the most familiar vehicle of expression in the first half of the fifth century b.c., and partly because it was the vehicle most suited to the imaginative conceptions of Nature which arose out of the old mythologies. But in the time of Lucretius a prose vehicle was more suited than any form of verse for the communication of knowledge in a systematic form. The conception of Nature was no longer mystical or purely imaginative as it had been in the age of Empedocles. Thus the task which Lucretius had to perform was both vaster and more complex than that of the early φυσιολόγοι. He had to combine in one whole the prosaic results of later scientific observation and analysis with the imaginative fancies of the dawn of ancient enquiry. He professes to make both conducive to the practical purpose of emancipating and elevating human life; but a great part of his argument is as remote from all human interest as it is from the ascertained truths of science.
All life and Nature were to his spirit full of imaginative wonder, but they were believed also to be susceptible of a rationalistic explanation. And the greater part of the work is devoted to give this explanation. This large infusion of a prosaic content necessarily detracts from the artistic excellence and the sustained interest of the poem. Lucretius speaks of the difficulty which he had to encounter in gaining the ear of his countrymen, in the lines,—
Quoniam haec ratio plerumque videtur
Tristior esse quibus non est tractata, retroque
Volgus abhorret ab hac[1].
And the unattractiveness of much of his theme is not diminished when the real discoveries of science have shown how illusory are his processes of investigation, and how false are many of his conclusions. He has made his poetry ancillary to his science, instead of compelling, as Virgil, Dante, and Milton have done, a subject, susceptible of purely artistic treatment, to assimilate the stores of his knowledge. His theme—'maiestas cognita rerum,'—is too vast and complex to be brought within the compass and proportions of a single work of art. The processes of minute observation and reasoning employed in establishing his conclusions are alien from the movement of the imagination. The connecting links of the argument are suggestive of the labour of the workman, not of the finished perfection of the work. And while some of the ideas of science may be so applied to the interpretation of the outward world, as to act on the imaginative emotions with greater power than any mere description of the forms and colours of external things, yet the pleasure with which processes of investigation are pursued is quite distinct from the pleasure derived from poetic intuition into the secret life of Nature and man. If it be the condition of a great poem to produce the purest and noblest pleasure by its whole conception and execution, the poem of Lucretius fails to satisfy this condition. It is in spite of its design and proportions,—in spite of the fact that long parts of the work neither interest the feelings nor satisfy the reason, that the poem still speaks with impressive power to the modern world.
And while the whole conception of the work, as regards both matter and method of treatment, necessarily involves a large interfusion of prosaic materials with the finer product of his genius, it must be added that there is considerable inequality of execution even in its more inspired passages. A few consecutive passages show indeed the finest sense of harmony, and are finished in a style not much inferior to that of Virgil. Such, for instance, are the opening lines:—
Aeneadum genetrix, hominum divomque voluptas, etc.;—
and again the lines in the introduction to Book iii.:—
Apparet divum numen sedesque quietae, etc.