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

But let every man prove his own work, and then shall he have rejoicing in himself alone, and not in another.

Each one should test his own work. Then he will have reason to boast in himself alone, and not in someone else.