The general purpose of Cicero’s philosophical works, was rather to give a history of the ancient philosophy, than dogmatically to inculcate opinions of his own. It was his great aim to explain to his fellow-citizens, in their own language, whatever the sages of Greece had taught on the most important subjects, in order to enlarge their minds and reform their morals; while, at the same time, he exercised himself in the most useful employment which now remained to him—a superior force having deprived him of the privilege of serving his country as an orator or Consul. Cicero was in many respects well qualified for the arduous but noble task which he had undertaken, of naturalizing philosophy in Rome, and exhibiting her, according to the expression of Erasmus, on the Stage of life. He was a man of fertile genius, luminous understanding, sound judgment, and indefatigable industry—qualities adequate for the cultivation of reason, and sufficient for the supply of subjects of meditation. Never was a philosopher placed in a situation more favourable for gathering the fruits of an experience employed on human nature and civil society, or for observing the effects of various qualities of the mind on public opinion and on the actions of men. He lived at the most eventful crisis in the fate of his country, and in the closest connection with men of various and consummate talents, whose designs, when fully developed by the result, must have afforded on reflection, a splendid lesson in the philosophy of mind. But this situation, in some respects so favourable, was but ill calculated for revolving abstract ideas, or for meditating on those abstruse and internal powers, of which the consequences are manifested in society and the transactions of life. Accordingly, Cicero appears to have been destitute of that speculative disposition which leads us to penetrate into the more recondite and original principles of knowledge, and to mark the internal operations of thought. He had cultivated eloquence as clearing the path to political honours, and had studied philosophy, as the best auxiliary to eloquence. But the contemplative sciences only attracted his attention, in so far as they tended to elucidate ethical, practical, and political subjects, to which he applied a philosophy which was rather that of life than of speculation.