Good question, and a good question always trumps a good answer, yet I'll try. One response might be...
'Will' is synonymous with desire. Thus, "whose will is bent on what he ought to do"
is the same as "whose sole desire is the performance of his duty"
. It's just brings home the point. You can think of will as what you really want - seriously - as though you were going to die moments from now.
Will - fundamental to life - is that need to survive which is shared by all life. Even viruses I suppose. Our myth of will being 'free' and somehow under our 'control' is rationally unsupportable. It is wishful thinking conjured up by a species that does too much thinking for its own good. Of course, I speak for myself.
PS. scholar shmallar. Dead man's words, as Chuang Tzu said. Mystery transcends scholar's skill to convey. Words only obfuscate, including mine. Though they are valuable to help us connect with our brother and sisters, as I'm doing right now. Using words to say words are useless is useful. [chref=78]Straightforward words, Seem paradoxical.[/chref]
We must each find our own way. Hey, kind of like the Christian's 'born again' thing, without any "everybody's got to do it my way or go to hell aspect".