His letters, the earliest of Christian writings, reveal him as the greatest of the interpreters of Christ’s mind, and as the founder of Christian theology. He writes, “I have been crucified with Christ; it is no longer I who live, but Christ who lives in me; and the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me” (Galatians 2:20).  Paul describes himself as small and insignificant in appearance: “His letters are weighty and strong,” it was said of him, “but his bodily presence is weak, and his speech of no account” (2 Corinthians 10:10).  He writes of having a disability, one that he had prayed God to remove from him, and quotes the Lord’s reply, “My grace is sufficient for you, for my power is made perfect in weakness.” Therefore, Paul went on to say, “I will all the more gladly boast of my weaknesses, that the power of Christ may rest upon me” (2 Corinthians 12:9).

Paul, the well-educated and cosmopolitan Jew from outside of Israel, and Peter, the uneducated fisherman from Galilee, had differences of opinion in the early years of the Church concerning the mission to the Gentiles.  More than once, Paul speaks of rebuking Peter for his continued preference for Jewish Christianity; yet their common commitment to Christ and the proclamation of the Gospel proved stronger than their differences; and both eventually carried that mission to Rome, where they were martyred. According to tradition, Paul was granted the right of a Roman citizen to be beheaded by a sword, but Peter suffered the fate of his Lord, crucifixion, though with head downward. 

adapted from Lesser Feasts and Fasts