1 Corinthians 15:9-10

15:9 For I am the least of the apostles, unworthy to be called an apostle, because I persecuted the church of God. 15:10 But by the grace of God I am what I am, and his grace to me has not been in vain. In fact, I worked harder than all of them – yet not I, but the grace of God with me.