In this passage, the apostle Paul is writing to the Corinthian Christians, addressing a situation in which some false teachers had come into the Corinthian church and were spreading false teachings. In response, Paul is defending his own apostleship and explaining the nature of the spiritual battle that he and the Christians are fighting.
Paul says that the weapons that he and the Corinthians are using to fight this spiritual battle are not the same as the weapons used by the world. The world's weapons are physical and material, but our weapons are spiritual and have divine power. Paul says that these weapons have the power to "demolish strongholds," meaning that they have the ability to break down the fortifications of false beliefs and false teachings.
Overall, it is a reminder of the nature of the spiritual battle that we face. It reminds us that the weapons we use to fight this battle are not the weapons of the world, but have divine power to demolish strongholds. This passage is a call to be vigilant in their spiritual warfare and to use the weapons of the Spirit to stand firm against false teachings and false beliefs.
2 Corinthians 10:3-4. Though we walk in the flesh, we don’t wage war according to the flesh; for the weapons of our warfare are not of the flesh, but mighty before God to the throwing down of strongholds.