Well I have to think about this post....voluntarily does seem to indicate one chooses....which is how I see free-will. The ability to choose.
I don't think he can unless the Holy Spirit first regenerates his heart and mind and spirit to know the things of God, to repent, obey and believe.
Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;) ... For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them." -- Ephesians 2:8-10"But God, who is rich in mercy, for his great love wherewith he loved us,
Paul says Christ saved us not after we had the good sense to choose wisely, but "while we were dead in sins."
The fact that free grace saved us without our contribution is so important to Paul he states it twice within a span of two verses.
I've enjoyed our conversation. I'll have to continue it tomorrow because I'm sleepy and it's past my bedtime. Good night, caww. God bless.