He who plants and he who waters are equal, and each shall receive his wages according to his labor.
ὁ φυτεύων δὲ καὶ ὁ ποτίζων ἕν εἰσιν, ἕκαστος δὲ τὸν ἴδιον μισθὸν λήμψεται κατὰ τὸν ἴδιον κόπον·
He that plants and he that waters, are one.
For by means of this he establishes another point also, viz. that they should not be exalted one against another. His assertion, that they are one, refers to their inability to do any thing without God that gives the increase. And thus saying, he permitted not either those who labored much to lift themselves up against those who had contributed less; nor these again to envy the former. In the next place, since this had a tendency to make men more indolent, I mean, all being esteemed as one, whether they have labored much or little; observe how he sets this right, saying, But each shall receive his own reward according to his own labor. As if he said, Fear not, because I said, You are one; for, compared with the work of God, they are one; howbeit, in regard to labors, they are not so, but each shall receive his own reward.
Then he smooths it still more, having succeeded in what he wished; and gratifies them, where it is allowed, with liberality.
Haydock Catholic Bible Commentary: 1 Corinthians
That planteth you by your first conversion. Apollo watered you by preaching the same truths. — He that planteth and watered, are one, aim at one and the same end. Wi. — According to his own labour. God does not recompense his servants according to the success of their labours, because their success depends upon him alone; but he recompenses them according to their sufferings and diligence in his service; for, whilst he crowns the labour of his apostles with success, he crowns his own work. S. Chrys. — This text most evidently proves that good works proceeding from grace are meritorious, and that the rewards in heaven are different, according as God sees just to appropriate them. The Greek word here employed is misqoV, (merces) or wages. See 1 Tim. v. 18. Apoc. xxii. 12. Matt. xvi. 27. It is by our union with Jesus Christ that our actions, of themselves without value or merit, become gold, silver, and precious stones. A.