7
Cleanthes, in Diogenes Laertius, quoted also by Seneca, Epistle 107.
8
Euripides, Fragments.
9
Plato, Crito, Chap. XVII.
10
Plato, Apology, Chap. XVIII.
11
Chapter XV of the third book of the Discourses, which, with the exception of some very trifling differences, is the same as chapter XXIX of the Enchiridion.—Ed.