  … nothing is so productive of greatness of mind as to be able to examine, systematically and in truth, each of the things that befall us in life, and to look always at it so as to consider what sort of use (chreia) it provides for what sort of cosmos and what value (axia) it has for the whole, and what in relation to the human being, they being a citizen of the highest city, of which other cities are like households (iii.11, cf. viii.11, iv.23, iii.2, vi.36, vii.13, x.20, 25)