Paul was unassuming and meek.
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 in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me. (1 Corinthians 15:9-10 KJV)
Paul was truly a humble servant of God. He saw nothing good in himself without the presence of God dwelling within Him. Paul gave due credit to God for His grace that resided in Him making in Him what he was all for the glory and honor of God. Paul did not rely on good deeds, his own morality, or keeping of the law. Paul relied solely upon God.
Many people today believe that they are what or who they are because of their own great accomplishments and strides in this life. They believe that they are good and moral people who have succeeded in their own strength; but Paul understood that he accomplished nothing good in his own strength but only evil and wickedness continually.
Those who see their own strength as insufficient for anything good in this life having placed their personal faith in the supernatural power of God through His finished work on the cross rely upon God’s power and not any of their own power.