17 This upright character of the Roman religion has been thoroughly
expounded by G. Boissier (_op. cit._, I, 30 ff, 373 ff). See also the
remarks by Bailey, _Religion of Ancient Rome_, London, 1907, pp. 103 ff.
18 Varro in Augustine _De civ. Dei_, IV, 27; VI, 5; cf. Varro, _Antiq.
rerum divin._, ed. Aghad, pp. 145 ff. The same distinction between the
religion of the poets, of the legislators and of the philosophers has been
made by Plutarch, _Amatorius_, 18, p. 763 C. The author of this division is
Posidonius of Apamea. See Diels, _Doxographi Graeci_, p. 295, 10, and
Wendland, _Archiv für Gesch. der Philos._, I, pp. 200 ff.