ἀνταποδοτέον
From LSJ
καὶ τὸ σιγᾶν πολλάκις ἐστὶ σοφώτατον ἀνθρώπῳ νοῆσαι → and silence is often the wisest thing for a man to heed, and often is man's best wisdom to be silent, and often keeping silent is the wisest thing for a man to heed
English (LSJ)
A one must repay, τὴν ἀξίαν ὧν ἔπαθεν Arist.EN1163a2; τιμήν 1163b14; χάριν 1164b26; τὰς εὐεργεσίας ib.31. II ἀ. ἕξιν τινί one must make it correspond to .., Pl.Phlb.40d.