The preceding discourse is followed by one upon the Retirement of a Wise Man. The beginning of this tract is wanting; but in the sequel the author discusses a question which was much agitated amongst the Stoics and Epicureans, viz., whether a wise man ought to concern himself with the affairs of the public. Both these sects of philosophers maintained that a life of retirement was most suitable to a wise man, but they differed with respect to the circumstances in which it might be proper to deviate from this conduct; one party considering the deviation (391) as prudent, when there existed a just motive for such conduct, and the other, when there was no forcible reason against it. Seneca regards both these opinions as founded upon principles inadequate to the advancement both of public and private happiness, which ought ever to be the ultimate object of moral speculation. The last of the author's discourses, addressed to Aebucius, is on Benefits, and continued through seven books. He begins with lamenting the frequency of ingratitude amongst mankind, a vice which he severely censures. After some preliminary considerations respecting the nature of benefits, he proceeds to show in what manner, and on whom, they ought to be conferred. The greater part of these books is employed on the solution of abstract questions relative to benefits, in the manner of Chrysippus; where the author states explicitly the arguments on both sides, and from the full consideration of them, deduces rational conclusions. The Epistles of Seneca consist of one hundred and twenty-four, all on moral subjects. His Natural Questions extend through seven books, in which he has collected the hypotheses of Aristotle and other ancient writers. These are followed by a whimsical effusion on the death of Caligula. The remainder of his works comprises seven Persuasive Discourses, five books of Controversies, and ten books containing Extracts of Declamations.