Freewill caused the falling away from Christ...
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. -
Hebrews 6:6
But why do they lack faith and patience, those that fall away?
Because they have no ROOT in them, read the parable of the sower.
There was only one where the seed fell that bore the good fruit, and that was the one with the good soil, which points to the good foundation that God had prepared in them.
Notice v17, that by two things, God swearing by an oath and it is impossible for God to lie, we have strong consolation to lay hold of the hope given to us by God. And the oath God swore is the same for us as for Abraham,
14 saying, “
Surely blessing I will bless you, and multiplying I will multiply you."
But unless you have the new heart, that new spirit inside given to you by God, being born of God, you will all fall away as you can not believe what God has said.
9 But, beloved, we are confident of better things concerning you, yes, things that accompany salvation, though we speak in this manner. 10 For God is not unjust to forget your work and [d]labor of love which you have shown toward His name, in that you have ministered to the saints, and do minister. 11 And we desire that each one of you show the same diligence to the full assurance of hope until the end, 12 that you do not become [e]sluggish, but imitate those who through faith and patience inherit the promises.
God’s Infallible Purpose in Christ
13 For when God made a promise to Abraham, because He could swear by no one greater, He swore by Himself, 14 saying, “Surely blessing I will bless you, and multiplying I will multiply you.” 15 And so, after he had patiently endured, he obtained the promise. 16 For men indeed swear by the greater, and an oath for confirmation is for them an end of all dispute.
17 Thus God, determining to show more abundantly to the heirs of promise the immutability of His counsel, confirmed it by an oath, 18 that by two immutable things, in which it is impossible for God to lie, we might have strong consolation, who have fled for refuge to lay hold of the hope set before us.
19 This hope we have as an anchor of the soul, both sure and steadfast, and which enters the Presence behind the veil, 20 where the forerunner has entered for us, even Jesus, having become High Priest forever according to the order of Melchizedek.