You tell us, "Many who consider themselves forgiven sinners will sin with the feeling of impunity, believing their salvation is sealed and there is nothing they can do to change it. They are living under a delusion."
When, in John 6:47, Jesus told us, "He who believes HAS eternal life" -- is that a delusion?
When, in John 10:28-29 Jesus tells us, "And I give eternal life to them, 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" -- is that a delusion?
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Bill, if you feel that you can live a rebellious lifestyle against God and still expect him to save and keep you, then you are under a serious delusion. I stand by that. There is no seal or security in Christ that can give us confidence of salvation while we live in wilfull and unrepentant sin. There is no seal that can keep us saved if we at some point choose to live in rebellion against God. You said earlier that if a person is living in rebellious sin, then they are not a child of God. So you cannot have it both ways here.
In one of your scriptures you left out an essential part of what Jesus was saying. You should have included the whole thought of what Jesus was saying as follows:
John 10:27 My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand.
Jesus described here just who his children are. Only those who hear the voice of Christ and follow him are his children. I have confidence that Jesus has not only saved me, but that he will keep me in his salvation. But my confidence is not in some past confession several years back, but in the reality of my present commitment to Christ as my Savior and Lord. I have confidence that Jesus will guide me, and will give me the grace and strength to follow him wherever he leads. My trust in not in my own ability, but in Christ's ability to sustain me. God will not allow me to be tempted more than I am able to bear. Whatever he calls me to do, he will give me grace to do. If I begin to take a path of error, he will warn me and correct me. I have confidence that Jesus has not only saved me but that he will continue to keep me in his salvation. But I am saved by faith, and faith is not a one time event, but it is a continual faithful and devoted walk with God. Those who are truly saved will endure to the end. They may stray for a time in weakness, but they will repent and turn back to following Christ. I would be a fool to think that I could go my own way and that Christ would keep me in his saving grace. Those who are truly God's children will hear his voice and follow him. Only they can have assurance that Jesus will keep them.
Lord is not a title, but it is a commitment to follow Christ wherever he leads. Those who truly make that commitment need not worry. Christ is more than able to keep those who commit their heart and life to him. However, I also accept the idea that a person can be lost. I believe it is a warning for those who haven't truly committed their heart and life to Christ as both Savior and Lord. God knows the end from the beginning, but men can be fooled and live under a delusion of reality. Many people claim to know Jesus as Lord, but when the tests come they fall away. There are only two ways of looking at it. They were either never saved, or they were saved and lost. I can accept either view. But there are clear warnings for those who believe they are somehow sealed and can do as they please and remain saved. We have an obligation to follow Christ all the way if we desire to be saved. Consider the following scriptures.
James 5:19-20 Brethren, if any of you do err from the truth, and one convert him; Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.
2 Peter 1:10-11 Therefore, brethren, be even more diligent to make your call and election sure, for if you do these things, (things representing growing and walking in the Christian faith) you will never stumble; for so an entrance will be supplied to you abundantly into the everlasting kingdom of our Lord and Savior Jesus Christ.
Luke 8:13 "But the ones on the rock are those who, when they hear, receive the word with joy; and these have no root, who believe for a while and in time of temptation fall away.
2 Peter 2:20-22 For if, after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the latter end is worse for them than the beginning. For it would have been better for them not to have known the way of righteousness, than having known it, to turn from the holy commandment delivered to them. But it has happened to them according to the true proverb: "A dog returns to his own vomit," and, "a sow, having washed, to her wallowing.
Bill, I don't believe that you would intentionally tell anybody that they can live in wilfull sin and have assurance of salvation. Yet, if you tell somebody that once they believe in Jesus and confess him as Lord, then they are sealed by the Holy Spirit, and no matter how they live they will remain saved, then you have contradicted yourself. If they truly accept Christ as Lord, then I accept that as true. But not all who claim Jesus as Savior and Lord are God's true children. The trials that come will test their commitment to see if it was real. So to put your trust in some seal while living in rebellious sin against God, is trusting in a delusion of reality. Only those who truly hear and follow Christ are his children. They are the ones that can have security that Christ will keep them. I hope we can agree on that.