“The three lives mentioned by Aristotle here answer to the
three classes of men distinguished by Plato (Rep. 581). .
. . Michelet and Grant point out that this threefold division occurs in
a metaphor attributed to Pythagoras by Heracleides Ponticus
(apudCic.Tusc. v. 3). . . .
“ Cf. Aristot.Eth. Nic.
1097 a-b (i. 5. 1), also Diog. L. vii. 130 on
Stoics, Plutarch, De liber. educ. x. (8 A), Renan,
Avenir de Ia science, p. 8.
Isoc.Antid. 217 characteristically recognizes only the
three motives, pleasure, gain, and honor. For the entire argument cf.
1176 a 31, 1177 a
10, and supr