The book of 2nd Corinthians is a series of Epistles written to the Corinthians by Paul (who was an Apostle of the Lord). These letters were reportedly written around 50 years after the death of Jesus Christ.
In chapters 1-7: Paul describes some of the attributes and responsibilities of an Apostle. Paul explains; “…we preach not ourselves, but Christ Jesus the Lord…” (2 Corinthians 4:5) Paul explains that while Christians are “Persecuted, but not forsaken; cast down, but not destroyed.” (2 Corinthians 4:9)
In chapters 10-13: Paul defends his authority and explains that many false Prophets will come and deceive them. Paul then decides to explain his own sufferings and persecutions to help them understand who and what he stood for. He explains that he is weak, just as they are! However, if he works to understand his short comings, his weaknesses will become strengths!