“For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God.”
King James Version (KJV)
15:9 I persecuted the church - True believers are humbled all their lives, even for the sins they committed before they believed.
1Co 15:9 For I am the least of the apostles. As far as human worth is concerned, not fit to be called an apostle. Because I persecuted the church of God. He could never forget that he had been a persecutor. See Ac 9:1,2 22:4 26:11 Ga 1:13 Php 3:6 1Ti 1:13.