If you do good to those who do good to you, what credit is that to you? Even sinners do the same.
Καὶ ἐὰν ἀγαθοποιῆτε τοὺς ἀγαθοποιοῦντας ὑμᾶς, ποία ὑμῖν χάρις ἐστί; Καὶ γὰρ οἱ ἁμαρτωλοὶ τὸ αὐτὸ ποιοῦσι.