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1 John 3:9 No one who is born of God will continue to sin,......1 John 5:18 says: "We know that anyone born of God does not continue to sin;

That is indeed the characteristic of saving faith, as it describes the character of those who are born from above, but it does not mean this precludes a believer from choosing to not persevere,

Likewise,

No man that warreth [soldiers, Luke 3:14] entangleth himself with the affairs of this life; that he may please him who hath chosen him to be a soldier. (2 Timothy 2:4)

However, while this is the proper character of a soldier, that does not mean one cannot betray that call.

Again, the problem with all this is that God many times warns believers, as believers, against forfeiting what justifying obtained. Such as against developing an "evil heart of unbelief in departing from living God," from the faith they once held, falling from grace, making Christ of no effect, to no profit, drawing back to perdition," and yielding to pressure to deny the faith after conversion, so that Paul's labor would be in vain, (Gal. 5:1-5; Heb. 3:12-14; Heb. 10:25-31, Heb. 10: 38-39; 1 Thessalonians 3:5)

Ask your AI who each verse is logically addressing, what faith they are appealing to, and what they are being warned against.

I am forced to conclude that God is warning believers against forfeiting what faith obtained, by the grace of God. And yes, seals can be broken. (Rev_5:1-2; Rev_5:5; Rev_5:9; Rev_6:1.)