But "'many' will fall-away" from the faith according to the N.T. that NewBirth quoted earlier.
If you notice in Paul's letters, when read chronologically, how humbly he speaks of his own salvation - and as in Phil 3 and elsewhere - but how in 2 Timothy, his last letter, he says something he couldn't say before in his earlier letters ....
2Ti 4:6 For I am now ready to be offered, and the time of my departure is at hand.
2Ti 4:7 I have fought a good fight, I have finished my course, I have kept the faith:
2Ti 4:8 Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at that day: and not to me only, but unto all them also that love his appearing.
Because they lack the fear of The LORD and believe that the works of "obedience" are not necessary for their salvation and don't heed James 2 and the many other warnings - there is a "falling away".
Loving God and Fearing Him has to go hand-in-hand -- according to all of the Scriptures with that word 'fear' in them.
We've tossed away the fear of The Lord in this generation. And He said, "If you love Me, you'll keep my commandments".
And -
Php 2:12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.
Php 2:13 For it is God which worketh in you both to will and to do of his good pleasure.
Heb 4:1 Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it.
Matt 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Matt 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Matt 25:11 Afterward came also the other virgins, saying, Lord, Lord, open to us.
Luke 6:46 And why call ye me, Lord, Lord, and do not the things which I say?
Luke 13:25 When once the master of the house is risen up, and hath shut to the door, and ye begin to stand without, and to knock at the door, saying, Lord, Lord, open unto us; and he shall answer and say unto you, I know you not whence ye are
Again: One cannot be IN The Book of Life UNLESS they've been grafted into the natural Olive Tree of Romans 11 ...
Rev 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.
Rev 22:19 And if any man shall take away from the words of the book of this prophecy,
God shall take away his part out of the book of life, and out of the holy city,
and from the things which are written in this book.
Rev 20:12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.