Galatians 6:4

τὸ δὲ ἔργον ἑαυτοῦ δοκιμαζέτω ἕκαστος καὶ τότε εἰς ἑαυτὸν μόνον τὸ καύχημα ἕξει καὶ οὐκ εἰς τὸν ἕτερον