Because of this, God sends them a working of error, that they should believe a lie;
The gospel is God’s last plea for mankind; therefore, if anyone rejects these truths, there is no hope for him—he is turned over to Satan. The delusions are simply the works of false teachers that the Lord will "take out of the way" (verse 7) when He returns. Steadfastness in belief of the truth is the only escape from the strong delusions in this world.