No, it's from Scriptures. Over and over, man is commanded to freely obey the Will of God. How can we be told to do something we CANNOT do???
This has nothing to do with the impetus that God gives us TO obey, but whether we use the gift God gives us in the first place. We both know we cannot obey God without God's graces. But we DO have the choice to use Grace or not.
Man is commanded to obey the word of God.
As for freewill, let's say we have freewill. So what's the point? It's like saying man can sin. So what?
Shouldn't we understand Jesus, when he prayed, 'My Father, if it be possible, let this cup pass from me; nevertheless, not as I will, but as thou wilt', that Jesus knew the Father would answer his prayer, that the Father would do for his Son as he prayed? Yet he prayed, 'if it be possible'. Could the Father cancel what he willed from the beginning? Yep.
But, nevertheless, Jesus prayed, 'not as I will, but as thou wilt' ie. past tense. This tells us the 'cup', which represents what would be, refering to his death on the cross, was foreordained.
So Jesus, knowing his death was declared from the beginning, also knew God could and would take the cup away. Yet he prayed, 'not as I will, but as thou wilt'.
In this way, and in his teachings, Jesus told us that all things are subject to the Father's will, and that all the things that we were told will come to pass, will come to pass by his will. And when we pray, we should pray, 'not as we will, but as thou wilt. Indeed we do. We pray, 'Thy will be done', in subjection, knowing he has willed what will be. He has even willed our prayer, in a way, because we are his sons, and he has given us his Spirit, and he has made his will known to us, and our desire is to do his will, and his will is that we should pray the prayer Jesus gave us.