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Who told you that you can not become unjustified after you have been justified? Who said you can not become guilty again after you have been forgiven? Do you have chapter and verse for this? Here is chapter and verse where Jesus himself said the Father will make the forgiven person accountable for his debt all over again in the kingdom of heaven. Just read the emboldened parts, then read whatever you want in between if you think I'm wrong about this:
23“For this reason the kingdom of heaven may be compared to a king who wished to settle accounts with his slaves. 24“When he had begun to settle them, one who owed him ten thousand talents was brought to him. 25“But since he did not have the means to repay, his lord commanded him to be sold, along with his wife and children and all that he had, and repayment to be made.26“So the slave fell to the ground and prostrated himself before him, saying, ‘Have patience with me and I will repay you everything.’ 27“And the lord of that slave felt compassion and released him and forgave him the debt. 28“But that slave went out and found one of his fellow slaves who owed him a hundred denarii; and he seized him and began to choke him, saying, ‘Pay back what you owe.’ 29“So his fellow slave fell to the ground and began to plead with him, saying, ‘Have patience with me and I will repay you.’ 30“But he was unwilling and went and threw him in prison until he should pay back what was owed. 31“So when his fellow slaves saw what had happened, they were deeply grieved and came and reported to their lord all that had happened. 32“Then summoning him, his lord said to him, ‘You wicked slave, I forgave you all that debt because you pleaded with me. 33‘Should you not also have had mercy on your fellow slave, in the same way that I had mercy on you?’ 34“And his lord, moved with anger, handed him over to the torturers until he should repay all that was owed him. 35“My heavenly Father will also do the same to you, if each of you does not forgive his brother from your heart.” - Matthew 18:23-35
See it? The debt really was forgiven, but then it was reinstated. This is how it is in the kingdom of heaven. This is what Jesus said his Father will do to you and I. How does that even remotely resemble a 'once saved always saved' doctrine? It doesn't, of course. The way you stay forgiven is stay in God's forgiveness. The presently believing person is in God's forgiveness. The person who stops believing removes himself from God's forgiveness.
23“For this reason the kingdom of heaven may be compared to a king who wished to settle accounts with his slaves. 24“When he had begun to settle them, one who owed him ten thousand talents was brought to him. 25“But since he did not have the means to repay, his lord commanded him to be sold, along with his wife and children and all that he had, and repayment to be made.26“So the slave fell to the ground and prostrated himself before him, saying, ‘Have patience with me and I will repay you everything.’ 27“And the lord of that slave felt compassion and released him and forgave him the debt. 28“But that slave went out and found one of his fellow slaves who owed him a hundred denarii; and he seized him and began to choke him, saying, ‘Pay back what you owe.’ 29“So his fellow slave fell to the ground and began to plead with him, saying, ‘Have patience with me and I will repay you.’ 30“But he was unwilling and went and threw him in prison until he should pay back what was owed. 31“So when his fellow slaves saw what had happened, they were deeply grieved and came and reported to their lord all that had happened. 32“Then summoning him, his lord said to him, ‘You wicked slave, I forgave you all that debt because you pleaded with me. 33‘Should you not also have had mercy on your fellow slave, in the same way that I had mercy on you?’ 34“And his lord, moved with anger, handed him over to the torturers until he should repay all that was owed him. 35“My heavenly Father will also do the same to you, if each of you does not forgive his brother from your heart.” - Matthew 18:23-35
See it? The debt really was forgiven, but then it was reinstated. This is how it is in the kingdom of heaven. This is what Jesus said his Father will do to you and I. How does that even remotely resemble a 'once saved always saved' doctrine? It doesn't, of course. The way you stay forgiven is stay in God's forgiveness. The presently believing person is in God's forgiveness. The person who stops believing removes himself from God's forgiveness.
First of all is the ruler/king Jewish?
Not likely since the Jews were not allowed to torture their servants.
This parable is about the limited ability of the law and pointing forward to the gentiles as part of the new covenant and so much more.