http://biblebitbybit.blogspot.com/2016/01/1-corinthians-1-v-1.html
Posted by 1 Corinthians on Sunday, 17 March 2013
1 Corinthians 1:1
Paul, called to be an apostle of Jesus Christ through the will of God, and Sosthenes our brother,
1:1. The legitimacy of Paul’s apostleship and its denial by some is hinted at in this letter (chap. 9), but receives explicit defense in 2 Corinthians. In the first words in 1 Corinthians Paul affirmed his appointment to this position by the will of God to represent not his own interests but those of Christ.
Sosthenes was probably Paul’s amenuensis and may have been the synagogue ruler publicly thrashed by the Jews (Acts 18:17). If so, he illustrates how God can turn the worst circumstances to a believer’s ultimate advantage.
Excerpt from:
Walvoord, J. F., Zuck, R. B., & Dallas Theological Seminary. (1983-c1985).
The Bible knowledge commentary : An Exposition of the Scriptures.
Wheaton, IL: Victor Books.