Now a different question is - is such and such person in such a state? God knows absolutely. Paul himself knew he could not in the end judge himself (1 Cor 4:3-5).
Paul did say that only God can judge him…
But Paul also said this:
“I have fought the good fight, I have finished the race, I have kept the faith. Now there is in store for me the crown of righteousness, which the Lord, the righteous Judge, will award to me on that day—and not only to me, but also to all who have longed for his appearing.” 2 Timothy 4:7-8
Paul, in prison, knowing he is about to die, states unequivocally: The Lord **WILL **award him the crown of righteousness. And not only to Paul, but to ALL who long for Christ’s coming.
Paul does not say “I think I probably will make it to heaven.” Paul declares boldly: "I have finished the race! Now the Lord
will award me! Not maybe, not probably, this WILL happen.
Just like Paul says in Romans “If you confess with your mouth Jesus is Lord and believe in your heart that God raised Him from the dead, you WILL be saved.” It is not, if you do these things, you might be saved. YOU WILL BE SAVED. Not probably. Paul did not say it would be likely. He said it WILL happen.
John says “I write these things to you who believe in the Son of God so that you may KNOW that you have eternal life.” John does not say “I write so that you may hope that you have eternal life.” John says… "so that you may
KNOW that you have eternal life.
In Acts, the jailer asks Paul: “What must I do to be saved?” Paul does not say “well, you cant really be sure that your going to be saved. But if you believe in Jesus and take part in our Christian religious ceremonies, you have a reasonably good chance of being saved.” No. Paul responds: “Believe on the Lord Jesus, and YOU **WILL BE **SAVED.” He does not say “might be saved.” He says WILL BE saved.