I believe we will pay for our sins if Jesus got us out of them and we go back knowing better. For example, suppose you are a smoker and feel led to stop smoking. I'm not saying smoking is a sin, mind, but just using it as an example. I knew a man who gave up cigarettes easily when he became a Christian. He never felt the urge to smoke again. I think if he had decided to do it again and got hooked again, Jesus may not have helped him with that problem again. If he wanted to stop, maybe he'd have to do it on his own.
If Jesus is willing to bear our burdens when we are too weak to do for ourselves, can we deliberately return to the sins that created those burdens and expect Jesus to bear them again and again? I don't think that's the deal (or covenant) we make with Jesus. If we try to take advantage of Jesus' generosity, we may find ourselves in the same fix as the unfaithful servant whose debts had been cancelled. They got put back on the books. That may sound astonishing to some people, but Jesus said that the sins we have been forgiven of can be reinstated.
Matthew 18:33 Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee?
34 And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him.
35 So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses.
People may want a free lunch, but I don't think it works like that. If Jesus does us a favor, we can help make the world a better place by doing favors for others. It is another astonishing doctrine, but Jesus expects us to do more him and for our fellow man than he does for us. He loves it when people do that because then he can reward them later for those good deeds. They have used the gifts God gave them well. They couldn't have done anything good if God hadn't given them the gifts and the power to use them; but God expects us to use our gifts well.
Matthew 25:26 His lord answered and said unto him, Thou wicked and slothful servant, thou knewest that I reap where I sowed not, and gather where I have not strawed:
27 Thou oughtest therefore to have put my money to the exchangers, and then at my coming I should have received mine own with usury.
I have a third doctrine some may find astonishing. People opine that God alone is going to make them into "sons of God." Hardly. God gives us power to become the sons of God.
John 1:12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
It is a wonderful thing when men and women do this. It proves that God was right from the very beginning to give man dominion over the earth. Satan was wrong if he thought man was a worthless creation.
But what do you do with someone who is advanced spiritually to the point where he has been given the power to become a son of God and he rebels against God and sets himself as his own god? Such a person was surely filled with the Holy Spirit -- but the Spirit fled when he set himself up as his own god. I cannot see any forgiveness or pardon for this, and I doubt that person could pay for that sin himself. He basically told the Spirit to get lost. I doubt he could get himself in the frame of mind to repent or to accept responsibility -- he's spiritually insane. Yes, I believe in a "beast of the water" that will arrive some day on the scene as described in Revelation; but I think there have been people, less capable than he will be of performing miracles, who have sinned the same way. What is the tragedy? Perhaps they craved to be immortal and then craved to return to sin after receiving immortality? It's to the outer darkness for them. Have you noticed that the three times the outer darkness is mentioned (in Matthew), it's God's unfaithful servants being punished so?
They have the immortality they craved. What is it worth? They'd be better off completely out of existence if you ask me. God is not mocked.