The only Latin philosophical literature was Epicurean, and, excepting the poem of Lucretius (_De Rerum Natura_), scarcely famous as yet, consisted entirely of books rudely written, although considerably read. (ii.) THE MISSION OF CICERO IN PHILOSOPHY. Cicero made no claim to originality as a philosopher, nor even to complete acquaintance with every detail of the Greek systems.[2] In early life he had studied with enthusiasm and success all the learning of the Greeks, but especially in the two departments of Rhetoric and Philosophy, then closely connected, or rather hardly distinguished. He not only sought the society of learned Greeks, but spent considerable time in study at Rhodes and Athens, which had become not merely the 'school of Greece', as Thucydides makes Pericles call her, but the school of the civilized world.[3] When, by reason of political troubles, he was forced to retire to private life, he began to carry out a great plan for interpreting the best philosophical writings of the Greeks to his fellow-countrymen. For this work his liberal views as a New Academic peculiarly fitted him. His usual method was to take one or two leading Greek works on the subject with which he was dealing, and to represent freely in his own language their subject-matter, introducing episodes and illustrations of his own. He thus presented to the Romans in their own tongue the most significant portions of the Greek Philosophy; and in his writings there has come down to us much, especially of the Post-Aristotelian Philosophy, that was doomed to oblivion in the original Greek. But further than this, to Cicero more than to any other Roman is due the formation of a Latin philosophical vocabulary, by which the language was enriched and fitted for the part it has since taken as the Language of the Learned. While on many points Cicero's own views can hardly be determined with perfect exactness, the exalted sentiments and the exquisite literary finish of his philosophical writings have always won admiration; and through them he has exerted no small influence on the literature and life of modern times.[4] (iii.) THE PHILOSOPHICAL WRITINGS OF CICERO. During the whole of an exceptionally busy public life Cicero devoted his spare moments to reading and to the society of the learned. After his exile in 58 and 57 B.C. his political career, except for a brief period just before his death, was over, and it is at this time that his period of great literary activity begins, In 55 he produced the work _De Oratore_, in 54 the _De Re Publica_, and in 52 the _De Legibus_, all three works, according to ancient ideas, entitled to rank as philosophical.[5]