I should have added this : that I think the whole emphasis on the will of man is focus on a secondary issue. Not a less important one, but evidence of man's reliance on his own ways (at some deeper level, anyway...)
A man's heart deviseth his way: but the Lord directeth his steps
Prov 16:9
The whole chapter is really packed. It opens thus :
The preparations of the heart in man, and the answer of the tongue, is from the Lord.
Prov 16:1
...and closes thus :
The lot is cast into the lap; but the whole disposing thereof is of the Lord.
Prov 16:33
Restated even more succinctly (for the purposes of this discussion, at least) here :
There are many devices in a man's heart; nevertheless the counsel of the Lord, that shall stand.
Proverbs 19:21
Man devises a lot of things, but in the end what he wants is subject to the Lord's will. Isaiah 46:10 more or less declares this outright and Paul confirms it:
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.
For it is God which worketh in you both to will and to do of his good pleasure.
Philippians 2:12-13
As far as I know, God is the only one of whm this is said - that will and action are both aligned and effectual. And scripture even goes so far as to say that God undermines man's plans (and maintains and upholds His own) :
The Lord bringeth the counsel of the heathen to nought: he maketh the devices of the people of none effect.
The counsel of the Lord standeth for ever, the thoughts of his heart to all generations.
Psalm 33:10-11
Paul's own experience with the futility of the will is found in scripture, too :
For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
Romans 7:15
So in my mind, the whole argument over free will highlights a couple of things:
1. Man's will really isn't free in the effectual sense.
2. The freedom that man has to desire and will many different things is secondary to the will of God.
Not that man's will is unimportant - since the Lord acknowledges it - but it seems its most useful function...in an eternal sense...is to die :
Saying, Father, if thou be willing, remove this cup from me: nevertheless not my will, but thine, be done.
Luke 22:42
After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.
Thy kingdom come, Thy will be done in earth, as it is in heaven.
Matthew 6:9-10
And when he had called the people unto him with his disciples also, he said unto them, Whosoever will come after me, let him deny himself, and take up his cross, and follow me.
For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel's, the same shall save it.
Mark 8:34-35
So when it comes to discussing it, it seems to me that the maintaining of some degree of what is called free will, but it is trying to keep alive what God has no interest in saving. Our life in Christ is to be an exchanged life - not a better version of what we already have (isn't that what being born again implies?). So the one who is in Christ is - like Paul - a genuine slave of Christ. Yet, as contradictory as it seems (to the natural man, for sure) that man is freer than any unregenerate man. That is liberty in Christ.