I agree with most of your post, Timmy, but I disagree in that a way has been provided that anyone may know for sure, and not be deluded. I use it all the time, and it is not held out for "believers" only. I don't believe this is given to aid anyone's judgement, but everyone's discernment, meaning that testing is given so that a person may know for themselves.
OK, spell out the method, please.
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty