Though born in a high position, he seems to have stood aloof from society. From first to last his book betrays the close and eager student. He was an intimate friend of the worthless C. Memmius, whom he extols in a manner creditable to his heart but not to his judgment. [48] But he was no flatterer, nor was Memmius a patron. Poet and statesman lived on terms of perfect equality. Of the date of his work we can so far conjecture that it was certainly unfinished at his death (55 B.C.), and from its scope and information must have extended over some years. The allusion [49]-- "Nam neque nos agere hoc patriai tempore iniquo Possumus aequo animo, nec Memmi clara propago Talibus in rebus communi desse saluti," is considered by Prof. Sellar to point to the praetorship of Memmius (58 B.C.). The work was long thought to have been edited by Cicero after the poet's death; but though he had read the poem, [50] and admitted its talent, he would doubtless have mentioned, at least to Atticus, the fact of the editing, had it occurred. Some critics, arguing from Cicero's silence and known opposition to the Epicurean tenets, have thought that Jerome referred to Q. Cicero the orator's brother, but for this there is no authority. The poem is entitled _De Rerum Natura_, an equivalent for the Greek _peri physeos_, the usual title of the pre-Socratic philosophers' works. The form, viz. a poem in heroic hexameters, containing a carefully reasoned exposition, in which regard was had above all to the claims of the subject-matter, was borrowed from the Sicilian thinker Empedocles [51] (460 B.C.). But while Aristotle denies Empedocles the title of _poet_ [52] on account of his scientific subject, no one could think of applying the same criticism to Lucretius A general view of nature, as the Power most near to man, and most capable of deeply moving his heart, a Power whose beauty, variety, and mystery, were the source of his most perplexing struggles as well as of his purest joys; a desire to hold communion with her, and to learn from her lips, opened only to the ear of faith, those secrets which are hid from the vain world; this was the grand thought that stirred the depths of Lucretius's mind, and made him the herald of a new and enduring form of verse. It has been well said that didactic poetry was that in which the Roman was best fitted to succeed. It was in harmony with his utilitarian character. [53] To give a practically useful direction to its labour was almost demanded from the highest poetry. To say nothing of Horace and Lucilius, Virgil's Aeneid, no less than his Georgics, has a practical aim, and to an ardent spirit like Lucretius, poetry would be the natural vehicle for the truths to which he longed to convert mankind.