The idea that the human will can ever be completely free, in the sense of an ability to choose beliefs or behavior totally free of influence from outside, is to divinize the will.  Everything about us as creatures is contingent- dependent on other things, our surroundings, our own nature.  Absolute independence is an attribute of God alone.  To predicate absolute independence of the human will is to predicate divinity of the human will, obviously a terrible error.