[Kizzy]

What I take from the OP is that the paradox is the whole concept of will is based on a belief structure, it may be where the phrase 'be careful what you wish for' and 'don't tease the cosmic joker' came from?
If you put something out there in the universe and you will it, then don't be surprised if it happens....but mot in the way you expect, say you get invited somewhere but you're working that day you might 'wish' you weren't and fall and twist your ankle, it's what you wanted but not quite.

I have a book called ' conversation with a witch' in it the concept described by the OP is outlined in the book as 'will' you are essentially asking the universe to provide you with something like placing an order, you believe it is out there and you are drawing it to you...it is not a 'wish' that still has doubt attached, when you say 'wish' there's the acknowledgement you don't have whatever it is or not enough.
Therefore a spell or an incantation is the asking of the universe/ goddess/spirit to bless you with what to require and trusting it is making it's way.

This is the same formula for prayer, you have perfect trust that the universe/god/spirit is answering your requests.
Which is why I hate ill willing even as a joke, it upsets me when I see thing like ' Why won't so and so just die'? I don't think anything like that should ever be put out there.