τῶν γὰρ μετρίων πρῶτα μὲν εἰπεῖν τοὔνομα νικᾷ → the first mention of the word moderation wins the game (Euripides, Medea 125f.)
Of things: P. and V. ἑκούσιος, αὐθαίρετος, V. ἑκών.
Of persons: P. and V. ἐθελοντής.