As a good friend of mine held that God values free will so much, permits us after getting saved to reject Jesus if we choose to!
He agreed that NONE can take them out of the Fathers hand once saved, but that God allows us to choose to walk away!
Well, Armianism to its logical conclusion?
That is what many Arminians believe, but that is not what scripture teaches.
When you accept Christ, you are joined to his spirit (Holy Spirit), just as in physical birth the sperm and ovum are joined together.
1 Cor 6:16 What? know ye not that he which is joined to an harlot is one body?
for two, saith he, shall be one flesh.
17 But he that is joined unto the Lord is one spirit.
Note how Paul compares our spiritual union to Christ with a physical union.
When a man and woman come together, they become one flesh in their children. Your children are both you, and your wife, but they are neither, they are a new creation, they are a new person.
Likewise, when you accept Christ, your spirit is first washed and cleansed from sin, and then joined to the Holy Spirit, and becomes ONE spirit. This is the new birth, being born again of the Spirit. You are a new creation, and a new person.
Now we partake in the divine nature.
2 Pet 1:4 Whereby are given unto us exceeding great and precious promises:
that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
A truly born again Christian cannot fall away in unbelief, because the Holy Spirit or "seed" remains in them and they cannot sin.
1 Jhn 3:9 Whosoever is born of God doth not commit sin;
for his seed remaineth in him: and he cannot sin, because he is born of God.
If you are truly born again and have received and been sealed by the Holy Spirit, you cannot fall away in unbelief because the Spirit or "seed" remains in you, and the Holy Spirit cannot sin.
You do not have to persevere, that is works. You are preserved by the Holy Spirit that lives and abides with you forever.
Jhn 14:16 And I will pray the Father, and he shall give you another Comforter,
that he may abide with you for ever;
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you,
and shall be in you.
Those persons who "fall away" are those persons who have been enlightened by the Spirit, and even brought to the point of repentance, but they turn and fall away from the truth. They "taste" of the word of God, but they do not "eat".
Heb 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.
You have free will once you are saved, just like you had before, but you have the Holy Spirit abiding in you forever, and therefore you will never will to reject God.