Variant translation: The spiritual virtue of a sacrament is like light : although it passes among the impure, it is not polluted. — As quoted in Familiar Quotations, 9th edition (1892) edited by John Bartlett, p. 169 — Comparable to: — The sun, too, shines into cesspools and is not polluted. — Diogenes Laërtius, Lib. vi. section 63 — A very weighty argument is this — namely, that neither does the light which descends from thence, chiefly upon the world, mix itself with anything, nor admit of dirhttps://en.wikiquote.org/wiki/Augustine_of_Hippo