I have heard some Calvinists claim that it is not.
Can free will co-exist with predestination?
Here’s a verse to get us started:
Matthew 23:37 "O Jerusalem, Jerusalem, the one who kills the prophets and stones those who are sent to her! How often I wanted to gather your children together, as a hen gathers her chicks under her wings, but you were not willing! 38 "See! Your house is left to you desolate; 39 "for I say to you, you shall see Me no more till you say, `Blessed [is] He who comes in the name of the Lord!’ "
That people are not willing is only half of the truth, and in no way proves
why they were unwilling. How do people become willing? Do they will to become willing? Or must they "be made willing in the day of [God’s] power- Psalm 110:3?
I believe the latter. The Bible teaches that Jesus Christ "was in the world, and the world was made through him, yet the world did not know him. (John 1:10)
This passage goes on to teach that "He came to his own, and his own
received him not" (v. 11). The Bible clearly teaches that men reject Christ by nature - for all men are “by nature children of wrath,” (Eph. 2:3) and therefore "this is the judgment: the light has come into the world,
but people loved the darkness rather than the light because their deeds were evil. For everyone who does wicked things
hates the light and does not come to the light, lest his deeds should be exposed.” (John 3:19, 20).
Is this the end of the story though? Does God sit back an allow his entire creation to perish - or does He move in power to save those whom He has chosen from the foundation of the world (His elect)?
I affirm the latter, and so do the Scriptures. How does God bring people to salvation - How does He bring them to faith in Christ?
The very next line in John chapter 1 demonstrates that only people who have been born of God, actually believe in Christ. So basically - the new birth, or regeneration is that which brings about a new heart that is willing to come to Christ (Ez. 35:26; Acts 16:14) - But the biblical fact is that only God elect are brought to faith by Him - (Acts 13:48).
“But to all who did receive him, who believed in his name, he gave the right to become children of God,** who
were** born, not of blood nor of the will of the flesh nor of the will of man, but of God.” (v. 13).
Clearly - those who believed in Christ were those who already “were” born again. This truth is confirmed by John again in 1 John 5:1, “Everyone who believes that Jesus is the Christ has been born of God.”
If you can prove that people repent, believe, and follow Christ by the power of thier own free will, thereby activating - or at least validating, or effectualizing God’s grace - then please do. But I believe that you have the order backwards. God’s grace regenerates the dead sinner, grants him a new heart and consequently a renrewed and liberated will, thereby effectually drawing him to repentance and faith in Christ.