Wake up CB!
The Ephesians were a solid, spiritual congregation, in whom Paul had every reason to have the confidence his words to them revealed.
Paul’s confidence in the Ephesians spiritual grounding had nothing to do with the world at large, and cannot be imputed thereto.
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So you are claiming that it was only the Ephesians who received the guarantee of the Holy Spirit and anyone else who receives the indwelling of the Holy Spirit it's not as a guarantee? I'm sure you can justify the view with scripture. I would like to see that scripture.