What I am (ο ειμ). Not, who (ος), but what (ο), neuter singular. His actual character and attainments. All "by the grace of God" (χαριτ θεου).

I laboured more abundantly than they all (περισσοτερον αυτων παντων εκοπιασα). This is sober fact as shown by the Acts and Paul's Epistles. He had tremendous energy and used it. Genius is work, Carlyle said. Take Paul as a specimen.