“If you do good
To those who do good
What credit is that
Do the same.”
καὶ γὰρ ἐὰν ἀγαθοποιῆτε τοὺς ἀγαθοποιοῦντας ὑμᾶς, ποία ὑμῖν χάρις ἐστίν; καὶ οἱ ἁμαρτωλοὶ τὸ αὐτὸ ποιοῦσιν.
Luke had Jesus continue in the same vain. If they did good (καὶ γὰρ ἐὰν ἀγαθοποιῆτε) to those who did good to them (τοὺς ἀγαθοποιοῦντας ὑμᾶς), what credit or gift was that to them (ποία ὑμῖν χάρις ἐστίν)? Even sinners did the same (καὶ οἱ ἁμαρτωλοὶ τὸ αὐτὸ ποιοῦσιν). Matthew, chapter 5:44, has something similar to this, but Matthew was more forceful there. Matthew indicated that Jesus told them to do good to those who were spitefully accusing them, hating them, and persecuting them. These early Christians were asked to be generous to their enemies and persecutors. Maybe later Christians might learn a little bit from the early followers of Jesus.