1 Corinthians 15:9-11

New Catholic Bible

⁹ For I am the least of the apostles. I am not worthy to be called an apostle, because I persecuted the Church of God. ¹⁰ However, by the grace of God I am what I am, and the grace he has bestowed upon me has not proved to be fruitless. Indeed, I have worked harder than any of them—although that should not be credited to me but to the grace of God within me. ¹¹ But whether it was I or they, this is what we preach and what you have come to believe.