βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink
P. and V. εὖ, καλῶς, ἀμέμπτως (Xen.).
chastely: P. ἁγνῶς (Xen.).
act virtuously (in a contemptuous sense), v.: P. ἀνδραγαθίζεσθαι.