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Λύπης ἰατρός ἐστιν ὁ χρηστὸς φίλος – A true friend is grief's physician.
grātiīs: (grātīs), v. gratia, B.
grātĭīs, v. gratia, gratis.
grātiīs, umsonst, s. gratiano. I, B, 2, b.