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Ὀργῆς χάριν τὰ κρυπτὰ μὴ ἐκφάνῃς φίλου → Arcana amici ne per iram prodito → Geheimnisse des Freunds verrate nicht im Zorn
intentionally: P. and V. ἑκουσίως, or use P. and V. ἑκών, εἰδώς, V. φρονῶν, all agreeing with subject.