... Psalm 69:28 May they be blotted out of the book of life and not be listed with the righteous.
Sounds to me like unless your name is in the book at that point, then whether it was ever in there or not doesn't matter.
This is the way I take it. I do not need to know the other. I don't need to know if a name is in there from before the foundation of the world, and is blotted out at a certain point, or if it was added at some point in the process of God the Father drawing a soul to the LORD Jesus Christ by His Holy Spirit. The fact is we are told the names are there, those not there are cast away, and that we do not wish to do anything that makes God blot us out from that book.
Revelation 3
5 He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
If we see that one specific way to NOT be blotted out is to overcome (be reminded that these are the words of the glorified LORD Jesus Christ,) we should be about making sure we overcome on His behalf. We should NOT succumb to every whim, in order to satisfy our lusts, or to exalt our opinion over God's word, or simply fail to be watchful till His coming. We should put our efforts into seeking to glorify the LORD Jesus Christ in all the ways He prescribed. We should seek the Holy Spirit of God to direct us that way.
Hebrews 6
4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
5 And have tasted the good word of God, and the powers of the world to come,
6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
7 For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God:
8 But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
Hebrews 10
30 For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people.
31 It is a fearful thing to fall into the hands of the living God.
Some consider these difficult scriptures, because they challenge the conventional wisdom on other scriptures or doctrines. If we do not include an understanding of the words of our LORD Jesus Christ, and those of His Apostles, we are on dangerous ground, not considering the whole testimony of God in defining our doctrines.
The problem with being locked into a doctrinal mindset, regardless of the preference for one versus another, is that we may tend to ignore other scripture that shows us differently, or describes a unique situation. In other threads on this forum, I had asked a number of people a simple question when they espoused a certain verse to support their preferred doctrine. Have not yet gotten an answer from ANYONE here on that simple question.
None of us should try to wrap-up God into 5 points of a doctrine, or into just ONE verse of scripture! Have been around too many people who do these things. They have their list of doctrines that are short enough to satisfy the human intellect, or they answer every scriptural challenge with, "...
but John 3:16 says..."
.