[328] De Officiis, lib. ii., ca. xxiv.
[329] Ibid., lib. iii., ca. i.
[330] De Republica, lib. vi. It is useless to give the chapters, as the treatise, being fragmentary, is differently divided in different editions.
[331] Ad Archiam, ca. xii.
[332] De Republica, lib. vi.
[333] Academica, 2, lib. i., ca. vii.
[334] Academica, 1, lib. ii., ca. xxxviii.
[335] De Officiis, lib. i., ca. xliv.
[336] Tusc. Disputationes, lib. i., ca. xxx.
[337] De Finibus, lib. v., ca. xxiii.