It is the didactic poem of Titus Lucretius Carus (655-699) "Concerning the Nature of Things," whose author, belonging to the best circles of Roman society, but taking no part in public life whether from weakness of health or from disinclination, died in the prime of manhood shortly before the outbreak of the civil war.

As a poet he attached himself decidedly to Ennius and thereby to the classical Greek literature.
Indignantly he turns away from the "hollow Hellenism" of his time, and professes himself with his whole soul and heart to be the scholar of the "chaste Greeks," as indeed even the sacred earnestness of Thucydides has found no unworthy echo in one of the best-known sections of this Roman poem.

As Ennius draws his wisdom from Epicharmus and Euhemerus, so Lucretius borrows the form of his representation from Empedocles, "the most glorious treasure of the richly gifted Sicilian isle"; and, as to the matter, gathers "all the golden words together from the rolls of Epicurus," "who outshines other wise men as the sun obscures the stars." Like Ennius, Lucretius disdains the mythological lore with which poetry was overloaded by Alexandrinism, and requires nothing from his reader but a knowledge of the legends generally current.( 16) In spite of the modern purism which rejected foreign words from poetry, Lucretius prefers to use, as Ennius had done, a significant Greek word in place of a feeble and obscure Latin one.

The old Roman alliteration, the want of due correspondence between the pauses of the verse and those of the sentence, and generally the older modes of expression and composition, are still frequently found in Lucretius' rhythms, and although he handles the verse more melodiously than Ennius, his hexameters move not, as those of the modern poetical school, with a lively grace like the rippling brook, but with a stately slowness like the stream of liquid gold.

Philosophically and practically also Lucretius leans throughout on Ennius, the only indigenous poet whom his poem celebrates.