Arcana Coelestia #344
344. What is the use of faith, that is, what is the use of knowledge, awareness, and doctrine related to faith, other than of becoming such as it teaches? The first thing faith teaches is charity, Mark 12:28-35; Matthew 22:35-40, charity being the end of everything faith has in view. If a person does not become as it teaches, what is knowledge or doctrine but something which is in fact nothing?
Revelation 20:7-9
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And after the thousand years, Satan will be released from his prison,
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and he will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together to the war; the number of whom is as the sand of the sea.
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They went up over the breadth of the earth, and surrounded the camp of the saints, and the beloved city. Fire came down out of heaven from God, and devoured them.