Jesus own words tell us that it's a done deal.
If you choose to not believe Him, that's on you.
John 5:24 Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.
John 6:37-39 All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of him who sent me. And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day.
John 10:25-30 Jesus answered them, “I told you, and you do not believe. The works that I do in my Father's name bear witness about me, but you do not believe because you are not among my sheep. My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father's hand. I and the Father are one.”
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Sooner or later you’re going to have to get it through your head that faith is the willful earnest keeping of the commandments, and absolutely nothing else.
That is why faith cometh by hearing, and hearing by the word.
AS John said in his first epistle, “believing in” Yeshua is living as he lived, not intellectual belief that he was born.
Yeshua’s “own words” say that only he who endures to the end shall be saved.
There are no “done deals” except the trip to hell for rejecting the narrow path he described.
Twist in the wind if you must; it doesn’t help.
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” All that the Father gives me will come to me, and whoever comes to me I will never cast out. “
Rather ironic considering our discussion of Judas. Jesus didn’t cast him out. Judas left on his own, deceived by sin and Satan.
Even if this person, for whatever reason, no longer believes?
John 3:18 New International Version (NIV)
Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God’s one and only Son.