1 Corinthians 15:8-11

and last of all, as to the child untimely born, he appeared to me also. For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God. But by the grace of God I am what I am: and his grace which was bestowed upon me was not found vain; but I labored more abundantly than they all: yet not I, but the grace of God which was with me. Whether then it be I or they, so we preach, and so ye believed.