In that case, it would not be temporary. And regarding losing it or having it taken back, consider the following:
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Because of this, the kingdom of heaven is like a king who wanted to settle accounts with his servants.
24As he began the settlements, a debtor was brought to him owing ten thousand talents.
f 25Since the man was unable to pay, the master ordered that he be sold to pay his debt, along with his wife and children and everything he owned.
26Then the servant fell on his knees before him. ‘Have patience with me,’ he begged, ‘and I will pay back everything.’
27His master had compassion on him, forgave his debt, and released him.
28But when that servant went out, he found one of his fellow servants who owed him a hundred denarii.
g He grabbed him and began to choke him, saying, ‘Pay back what you owe me!’
29So his fellow servant fell down and begged him, ‘Have patience with me, and I will pay you back.’
30But he refused. Instead, he went and had the man thrown into prison until he could pay his debt.
31When his fellow servants saw what had happened, they were greatly distressed, and they went and recounted all of this to their master.
32Then the master summoned him and declared, ‘You wicked servant! I forgave all your debt because you begged me.
33Shouldn’t you have had mercy on your fellow servant, just as I had on you?’
34In anger his master turned him over to the jailers to be tortured, until he should repay all that he owed.
35That is how My heavenly Father will treat each of you unless you forgive your brother from your heart.”
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The King in the parable above, is representing the Lord and the servant is representing the believer. Likewise, the debt represents the believers sins. Notice that in v.27 the King/God forgave the servant/believer his entire debt. However, when that servant/believer failed to forgive his fellow servant/believer, the King/God reinstated his debt. Then Jesus says, this is how my heavenly Father will treat each of you unless you forgive your brother from your heart.
So, debt forgiven and debt reinstated.
I am a proponent of once saved always saved, if faith is maintained. However, I am not a proponent of 'once saved always saved' no matter how one lives.