Here are some of the things Paul said about his lack:
For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God.
1 Corinthians 15:9
Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief.
1 Timothy 1:15
I, Suzi Shumaker, am the worst of all the sinners. I am unworthy of salvation. I tell you this freely because, in the following weeks, I plan to write about my life since leaving the FOC and I know that there will be legalists from that group who will jump at the chance to point out how unworthy I am to present the gospel message. And when they do so, I will remind them that the great Apostle Paul, also claimed to be unworthy and the chief sinner.