1 Corinthians 15:9-10 NIV

[9] For I am the least of the apostles and do not even deserve to be called an apostle, because I persecuted the church of God. [10] But by the grace of God I am what I am, and his grace to me was not without effect. No, I worked harder than all of them—yet not I, but the grace of God that was with me.