As he presented himself a pattern to the believers, the apostle came to the matter of his apostleship, which gave him authority to deal with all the problems covered in this book, serious problems concerning the church life and its fellowship. His handling of these problems was based not only on his teaching but also on the authority inherent in his apostleship. To deal with the situation, he had to take this standing and make this matter clear to the Corinthian believers. They had questioned his apostleship and were in a chaotic situation, mainly because of the foolishness of their worldly wisdom, self-confidence, and pride.
The Greek word for apostle means one who is sent. An apostle of the Lord is a believer who is sent out by Him with His authority to preach the gospel of God, to teach the divine truth, and to establish churches. In the first section of Acts, Peter and John were such apostles among the Jews, and in the second section of Acts, Paul and Barnabas were such apostles among the Gentiles. After them, others also became apostles, such as Silas (i.e., Silvanus) and Timothy (1 Thes. 1:1; 2:6). As long as one has the power to preach the gospel, the gift to teach the divine truth, and the ability to establish churches, he is qualified and confirmed to be an apostle sent by the Lord with His commission and authority.