Apophthegm

First attested 1553, from Ancient Greek ἀπόφθεγμα (apóphthegma), from ἀποφθέγγομαι (apophthéngomai, “I plainly speak my mind”), from ἀπό (apó, “from”) + φθέγγομαι (phthéngomai, “I speak loudly”).