BDBD is 2 Corinthians 11

No doubt, Paul did not have a hum-drum normal easy life. He endured a lot of that which I want to avoid. Why did he press on? Because of his love for God and God’s people. Jesus said his people would suffer for his namesake. I should know things like these will happen.
  Paul several times in this chapter stated his repulsion to boasting. Yet he found the need to boast because the Corinthians were listening to others who were impressive on the outside. Yet they preached a false Jesus, a false gospel, and offered a counterfeit spirit. Just because a preacher or denomination uses the name of Jesus, doesn’t mean what they say and do is Godly and true. Satan can appear as an angel of light, meaning he can look impressive while he leads people away from the truth.