Key words in this passage:
σφραγίζω sphragízō ("to seal") signifies ownership and the full security carried by the backing (full authority) of the owner. "Sealing" in the ancient world served as a "legal signature" which guaranteed the promise (contents) of what was sealed.(HELPS Word-Studies)
ἀρραβών arrhabṓn ("down-payment pledge") is the regular term in NT times for "earnest-money," i.e. advance-payment that guarantees the rest will be given. 728 (arrhabṓn) then represents full security backed by the purchaser who supplies sufficient proof they will fulfill the entire pledge (promise).
There are no passages in the NT that ever tells us we are ever unsealed.
Regarding Galatians:
But Paul goes on in verse 4 to say, “You are severed from Christ, you who would be justified by the law; you have fallen away from grace.” Paul is talking to Gentile Christians who had been wrongly taught by the Judaizers that they have to be circumcised and obey the Mosaic Law in order to be true Christians. Paul tells them that is false, and if they submit to circumcision and to the Old Law, they will be “severed from Christ.” If once saved always saved is true, though, they can’t be severed from Christ and, once again, Paul’s warning is meaningless.
Context, context, context.
Paul is making the point that if you're counting on circumcision or the Law to save you you're no longer counting on Christ to save you....hence that would be a falling away from the grace of Christ. He is saying if you think doing the works of Law will save you as opposed to Christ.....you are wrong. You are no longer relying upon the forgiveness of Jesus.
Remember who the audience is....Gentile Christians. They are already saved. We have no evidence they attempted to return to Judaism.
The Prodigal Son
Who was Jesus talking to in Luke 15? See Luke 15:1-2
Which groups did the two sons in the parable represent?
Who was attempting to follow God?
Who was not and therefore who was dead?
Who had remained with God?
Who returned back to the Father's house?
Also in Luke 15 read the other two parables about the man who looks for the lost sheep and the woman who looks for the lost coin. What are the reactions of Heaven?
Summary:
The same people who tried to mislead the Galatians are the same people who are trying to mislead you regarding works for salvation.
For those attempting to "earn" their salvation by "works" or keep their salvation by "works; how many do you have to do? How much? How do you know you've done the right ones?
If the catholic dies with unconfessed sin to a priest....do they go to Heaven or Hell? The Roman Catholic Church will tell you Hell as you have severed yourself from Christ due to your sin.
Let me ask this.....were you a sinner before you were saved, that is believed Christ?
Did He allow you into His family then? In other words, were you "good enough" to get in?
Why would He kick you out for your sins? In other words, can you be bad enough that the shed blood of Jesus is insufficient to cover those sins?
Paul was a murderer of Christians and he was forgiven.
David was an adulterer and a murderer and he was forgiven.
Abraham was a liar and an adulterer and he was forgiven. In fact, the Bible says that Abraham BELIEVED God and it was reckoned to him as righteousness. And this was before circumcision and the Law.
Peter at one time refused to eat with the Gentiles...yet no one doubts his salvation. He never did.
In fact, none of these individuals ever doubted their salvation.
For those who have placed their faith in Christ, your salvation is secure. We have the Holy Spirit of promise given to us as a pledge of our security.
God does not go back on His promises.
I love St Paul’s letter to the Ephesians. He shows how we have been saved, in PAST TENSE.
Charles Manson and Jeffrey Dalhmer were “saved”. Rekon their in heaven?