I don’t think for Lewis (and I’m following Lewis on this in my work SttH, the third edition of which is available for free download below in my sig) “will” and “intellect” are so divisible that one comes before the other. Skill of the intellect develops, and talent may vary depending on circumstances, but the will is rational from the moment it begins to exist (derivatively speaking)–not necessarily competent, but rational.
Data arrives to a newborn will as a stream of sense experiences, and the will actively begins accepting (or even actively rejecting, but probably not yet) and sorting the data, and actively reaches to search out more data sooner or later. The environment, not the intellect, is what brings the data to work with, and from which the will acquires more data; the intellect represents the will’s competency at (for want of a more accurate word) “truth-ing” the data, whether the data arrives unsought or is acquired by the reaching of the will. The will also generates data to be processed for true understanding by will (whether by that will or by another will with access to the data thus generated).
Not all libertarians might agree with me (and Lewis ) on this–in fact I’ve been called a complementarian by a libertarian and vice versa, both of them rejecting me in disgust – but the only truly libertarian free will must be God’s. And from God’s Boethian standpoint transcendent to linear time (at right angles to linear time, as Lewis suggests in an appendix to MaPS 2nd edition, although he stresses he’s using a physical analogy for convenience of illustration), God’s knowledge doesn’t precede God’s action or action precede knowledge, not even in an ontological hierarchy where one depends on the other for relation of existence.
That’s kind-of true for us, too: knowledge and action occur simultaneously, but competency doesn’t. Nor does specific consciousness (for us derivative act-ers) of knowledge. People sometimes know things without knowing they know.
If I had to come down in favor of one preceding the other for created intelligences like ourselves, however, I’d definitely go in favor of action preceding knowledge, since competency and extent of knowledge depends on action. (As well as on environmental conditions, for us who are generated in a naturally reactive universe.)
In the mythic language of Genesis (and if you know Lewis you know I don’t mean to deny historicity thereby), Adam and Eve acquire the knowledge of good and evil by the action they choose to make. But they do have a pretty clear option set to choose from, and prior knowledge (developed by their actions as rational entities). They can either choose to trust God, Whom they have exactly no good reason NOT to trust, or they can choose not to. They choose not to, breaking the interpersonal relationship. They would have received the knowledge of good and evil EITHER WAY–the fruit of the tree was good after all. But they chose to get it by acting irrationally, over against what they already had good reason to believe was true about reality. They could have been intentionally responsible, but they intentionally chose to act irresponsibly. In principle, there isn’t any difference between their sin (or any sin of ours subsequently) and that of Satan: we’re all, in that regard, the chief of sinners, acting against the ground of our existence, Who is Himself an interpersonal relationship of fair-togetherness–and Who because He eternally chooses to exist self-begettingly and self-begotten, thus in and as a valid supportive interpersonal communion acts to keep us in existence anyway, despite our doing things which would result in God’s annihilation if He did them.
But that means God has intentions for us which don’t result in a fulfillment of final non-fair-togetherness between us as persons and other persons. To keep us in existence while we continue impenitently, or to let us go (or to force us) out of existence as impenitent sinners, would be a breach of His own existence as Justice; He must be acting toward bringing us back to accepting and acting in righteousness instead.
The blame thus comes, not in honestly but mistakenly valuating what is properly good and choosing to attain it, but in choosing to act against what the will perceives and understands (even if mistakenly!) to be true.
(So for example St. Paul says it would be a sin to try to coerce people into doing or even into accepting what they believe to be ethically wrong, even if what they’re rejecting is not in fact ethically wrong: they’d still be acting against the truth in principle.)
As Lewis puts it, referencing Romans 2, none of us sin against a foreign law, but against what we ourselves already regard to be truly good. Any sin, consequently, is a sin against the light, a sin against the Holy Spirit: “You are saying I cast demons out by Beezeboul! If I am casting out by power of the Plunder-possessor, by whom do your sons cast them out!? Consequently, they shall be your judges!” We cheat against the principles we accept when we think it’s in our favor.
chapter 40"]In this, and in other ways, I know that I ought to do something because I think reality (especially interpersonal reality) is such-n-such a way; but I nevertheless sometimes choose to do the other thing, if I possibly can.
Essentially, I want to be the person who defines what is and is not the actual principles of interpersonal relations (or what is “good”), and to be the one who defines what is and is not true.
In fact, I do not merely want to define them (since that might involve discovery and categorization of them), but to change them from what I know (or think) them to be.
At those times, I do not merely want to be God with the authority of God.
In essence, I want–and more importantly I am willfully trying–to be God over against God.