I would not hesitate to say that “the Book of Life” and the writing of its contents had no beginning and has no ending, for it is a conception of God, and everything known by Him is from everlasting (eternity past) to everlasting (eternity future), as in Psalm 90:2. Eternity has no time but it can be compared to time to reveal its meaning, and such is the Book of Life.
Concerning the compiling of its contents (names of people), it had no beginning, for God has always known who they are which will inherit “eternal life” (Mat 25:34). Concerning those involved in its contents, they do have a beginning, but no ending, for God knew when He would create, and knew all who would inherit eternal life even prior to creating, which content of this foreknowledge is unchangeable and unalterable. Can the destiny of one’s life change? All have only one destiny, and the concept of it changing would nullify the meaning of destiny.
For the Christian in this life, there is no greater encouragement than that of being convinced by “the word of truth,” that everyone who is truly “born again” will inevitably enter the eternal presence of God. If the Enemy can adversely affect the believer concerning this truth alone, there will never be a greater “weight” (Heb 12:1) that can hinder the believer from being “strong in faith” (Rom 4:20), nor one that could cause one to be any weaker (Rom 14:1), for the promise of eternal life is the sole hope of the believer in this life—it being the predominant support for the entirety for Scripture.
The hypocritical lives of those who “say” (Jam 2:18) they are redeemed but in truth are not, they give the appearance that one can attain regeneration (born again) and eventually forfeit its position (un-born again?), but this would not be eternal salvation, but rather temporal salvation, which is a non-existent concept in Scripture.
There exists Scriptural terminology which appears to refute this truth, but closer studies reveal their doctrines do not, and everyone is welcomed to present Scripture on which we can examine and share our thoughts and understanding. For example, passages pertaining to the “blotting out” of names in “the Book of Life” never actually design the intention of removing a name from “the Book.”
Here are some examples on which John Gill comments:
Exodus 32:32—“and if not, blot me, I pray thee, out of the book which thou hast written“: “of eternal life, and is no other than the book of life of the Lamb, or God's predestination or choice of men in Christ to everlasting life, which is particular, personal, sure, and certain; and Moses asks for this, not as a thing either desirable or possible, but to express his great affection for this people, and his great concern for the glory of God; and rather than either should suffer, he chose, if it was possible, to be deprived of that eternal happiness he hoped for, and should enjoy.
Exodus 32:33—“whosoever hath sinned against Me, him will I blot out of My book”: “Not that anyone that is really in the book of life is ever blotted out, or that anyone predestinated or ordained to eternal life ever perish: but some persons may think themselves, and they may seem to be written in that book, or to be among the number of God's elect, but are not, and turn out obstinate impenitent sinners, and live and die in impenitence and unbelief; when it will appear that their names were never written in it, which, is the same thing as to be blotted out of it, see Psalm 69:28.”
Revelation 3:5—“And I will not blot out his name out of the book of life”: “by which is meant the choice of persons to everlasting life and salvation; and this being signified by a book, and by writing names in it, shows the exact knowledge God has of His elect, the value He has for them, His remembrance of them, His love to them, and care for them; and that this election is of particular persons by name, and is sure and certain; for those whose names are written in it shall never be blotted out, they will always remain in the number of God's elect, and can never become reprobates, or shall ever perish; because of the unchangeableness of the nature and love of God, the firmness of His purposes, the omnipotence of His arm, the death and intercession of Christ for them, their union to Him, and being in Him, the impossibility of their seduction by false teachers (Mat 24:24), and the security of their persons, grace, and glory in Christ, and in whose keeping this book of life is; which respects not this temporal life, that belongs to the book of providence, but a spiritual and eternal life, from whence it has its name.”
To me, the phrase “And I will not blot out his name” does not intend the possibility of a name being blotted out, but rather a situation which discloses the converse of such an action transpiring. My reason for continuing to address the truism of "Eternal Salvation" (Heb 5:9) is due to it being the most significant doctrine concerning spiritual growth. Again, the belief of one concerning this truth does not affect the receiving of salvation, but will affect the strength of one's faith.
The Christian life is not our living a life like Christ, or our trying to be Christ-like, nor is it Christ giving us the power to live a life like His; but it is Christ Himself living His own life through us; 'no longer I, but Christ. -MJS