Paul wrote about people living according to the flesh. Some scholars think Paul was writing about people doing the kinds of things that people who do not believe in God do. Other scholars think Paul was saying that even though he still has a body made of flesh, he did not have to do the sinful things he wanted to do. He did not live in the same way non-Christians live.
When Paul used the words, “wage war according to the flesh,” this was a metaphor. Paul wanted Christians to obey God. He wanted Christians to fight against Satan and his demons, who tried to get Christians to sin.
When Paul spoke about a “stronghold,” this was a metaphor. A stronghold was a place with high walls to protect against attack (see: Proverbs 21:22). In the same way, in spiritual warfare there were people and demons who opposed Christians as they tried to teach people about Jesus. These people and demons were stopped by believing in Jesus.
Scholars think that when Paul spoke about a “high thing” he was speaking about people who argued that people shouldn’t believe in Jesus. However, their arguments were not based on truth. Instead, their arguments were meant to deceive people into believing false teachings.
When Paul spoke about taking “every thought captive” he continued his use of the metaphor for warfare. Some scholars think that just like an army captured enemies, so Paul spoke the truth of God to those who were speaking lies. That is, he spoke truth to the crowds listening to the false teachers. Other scholars think Paul was speaking about making sure he thought the right things about the gospel.
When Paul used the words, “build you up,” this was a metaphor. Paul was encouraging the Christians to know more about God, to love God more, and to obey God more. Paul wanted Christians to trust God more.
Some people thought that Paul was weak. Some scholars think Paul was weak because he was often sick (see: Galatians 4:13-15). Others scholars think the people did not think Paul was a strong leader, and that he was not a powerful speaker (see: 2 Corinthians 11:6; Exodus 4:10).
God gave Paul permission to serve God in places where Paul was the first apostle to tell people about Jesus and begin churches. Since Paul told the Corinthians about Jesus, he lead them. Some scholars think Paul wanted to say that he would not boast about something another apostle did. That is, he would only boast about the things that God used him to do.
Paul wrote, “one who recommends himself.” He was writing about a person who praised himself for selfish reasons. That is, they told other people how great they were.