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Ὠς χαρίεν ἔστʹ ἄνθρωπος, ὅταν ἄνθρωπος ᾗ → What a fine thing a human is, when truly human!
Use adj. P. πρόδρομος (also Eur., Iphigenia in Aulis 424, but the passage is doubtful).