But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I labored more abundantly than they all: yet not I, but the grace of God which was with me.
All Commentaries on 1 Corinthians 15:10 Go To 1 Corinthians 15
Augustine of Hippo
AD 430
Paul did not labor in order to receive grace, but he received grace so that he might labor.