Popeye catch-phrase aside, Paul is telling us something about the power of the character of the living God here.
Paul was not one of the original 12 Apostles. He did not walk alongside Jesus. In his own words he was 'abnormally born' into the kingdom and in particular, apostleship. Paul became the ultimate proponent for the universal Church, that is, to the Jews & Gentiles...thanks to the grace of God alone.
We know what Paul was thanks to his writings and legacy. Has the grace of God effected you so dramatically?