Last Wednesday I spoke about the great turning point in St. Paul's life after his encounter with the Risen Christ. Jesus entered his life and transformed him from persecutor into apostle. That meeting marked the start of his mission. Paul could not continue to live as he did before. Now he felt invested by the Lord with the charge to proclaim his Gospel as an apostle.
It is precisely about this new condition of life, namely of his being an apostle of Christ, that I would like to speak today. In keeping with the Gospel, we normally identify the Twelve with the title of apostles, thus intending to indicate those who were life companions and hearers of Jesus' teaching. But Paul also feels himself a true apostle and it seems clear, therefore, that the Pauline concept of apostolate is not restricted to the group of Twelve.
The second characteristic is to "have been sent." The Greek term "apostolos" itself means, in fact, "sent, ordered," that is, ambassador and bearer of a message; therefore he must act as charged with and representative of a mandate. It is because of this that Paul describes himself as "Apostle of Jesus Christ" (1 Corinthians 1:1; 2 Corinthians 1:1), namely, his delegate, placed totally at his service, so much so as to call himself "a slave of Jesus Christ" (Romans 1:1). Once again the idea appears in the first place of another initiative, that of God in Jesus Christ, to whom one is fully obliged, but above all the fact is underlined that a mission was received from him to fulfill in his name, putting absolutely in second place all personal interests.
A typical element of the true apostle, brought well into the light by St. Paul, is a sort of identification between the Gospel and the evangelizer, both destined to the same end. No one like Paul, in fact, has evidenced how the proclamation of the cross of Christ appears as "a stumbling block" and "foolishness" (1 Corinthians 1:23), to which many react with incomprehension and rejection. This occurred at that time, and it should not be surprising that the same happens also today. The apostle also shares in the destiny of appearing as "a stumbling block" and "foolishness," and Paul knows it; this is the experience of his life.
Zenit.org has the full text.