Will is at once an exceedingly simple and amazingly complex subject. It took me years to get to the understanding I currently possess, and I am fairly certain I am not yet done with my learning on this matter. Suffice it is to say that this page will not be able to cover fully my Life's lessons regarding Will.
Will constitutes that which a person means to do. For example, if you feel you need to open a window, then, in a sense, it is your Will to do so.
However, Will is not some casual and flippant representation of every passing whim of the individual (See Brother R.B.'s thesis on the matter for a countering viewpoint). Understanding Will absolutely demands an understanding of respect for all things. To execute one's Will, one must actively seek to respect the Will of others.
The theory is that if every person were following their true Will, there would never be any unneccessary conflicts between persons, because the nature of the Universe, with all its complexity, includes these interworking Wills. Conflicts which do occur are generally caused by either someone straying from their True Will, or are conflicts which need to happen to further the evolution of humanity.
Will is not frivolous in nature. It represents a very serious commitment to understanding one's role in the Universe, and to acting on that commitment.
Some people seem to think it is their Will to force others to do as they demand. Though it is possible that their True Will includes such activities, I personally find it more likely that people who lean on this as justification for their actions are generating false rationalizations.
An example: A friend of mine was heavily involved with the local wiccan community, and hosts the ceremonies for the Sabbats. One year, she was caught in a public place discussing the upcoming ceremony in the presence of the head of a new Thelemic organization in town. He pointedly asked her if he would be invited to come to the event. It was a bit rude to ask like that, in a public place, because any answer other than in the affirmative would certainly be rude, given his status at the time. So she invited him to the Sabbat.
He showed up with several of his underlings, and during the preceremony gathering, they all proceeded to get drunk. During the ceremony, they began to urinate -- and I don't have all the details on this part, as to whether it was on the altar, or in the circle, or what have you -- and thought this was just the funniest thing that they'd ever seen happen.
My friend's mate was a fairly well grounded Thelemite, and, incidentally, a member of the O.T.O., and he approached these jerks. Their response? "Why, were just doing our will, brother. You should let us continue."
His response was "If you continue to dishonor and desecrate a ceremony that all these people", and he gestured to the crowd behind him, "hold sacred, then it'll be my Will to kick your asses out of here."
They were stunned. Descriptions of their stunnedness suggest that perhaps this condition was prolonged by their collective inebriated stupor. My friend's mate then leaned forward, gave a small half wave and said "93!". He turned his back on the jerks and returned to whatever function he was performing before the distraction.
After awhile, the drunkards wandered away.
I'm convinced that it wasn't really their True Will to pee in the circle, but of course I'll never know. I'm sure they were just using the Law of Thelema as a shield to hide behind, in a vague and immature attempt to justify their ascinine actions.
One of the clearest signs I have come to recognize that someone is falsely justifying their action as being in accord with their True Will is when they try to use that argument to other people in defense of their actions.
A Thelemite doesn't concern himself with justifying his actions to anyone. What does it matter what those other people think? The only thing that matters is that the action was in league with the Thelemite's understanding of his own True Will. Noone else dictates it, and it caters to noone else. Therefore, what they think of it is of no concern to the Thelemite.
So when I hear people defending their actions, presenting as their strongest, and frequently only, evidence the fact that they are doing their Will, all sorts of red flags go up.
Not that it matters what I think; in fact, spending any amount of time on the matter of the True Will of another being is pretty much wasted time anyway; the focus of a Thelemite is his own True Will. Period.
Ironically, after much time spent in pursuit of understanding Will and attempting to describe Will to others, I have discovered that I actually learned more about Will when I was focusing on the Will of others, rather than myself and my own Will; the difference was that I was trying to find ways to not infringe upon the Will of others, as opposed to trying to ascertain what it was. It was then, and only then, that I began to develop any sense of understanding my own Will, and understanding Thelema as a concept unto itself. And so, only by spending a lot of time looking into the Will of others was I able to see what a waste of time worrying about the Wills of others was, and yet, it was only by this means I could have come to the realization.
And so Will is actually quite a complicated subject. To know what one's True Will is takes a lot of introspection, and to execute one's Will requires a great deal of patience and care.
The Law of Thelema is all about learning one's True Will and executing it.
Books You Might Enjoy:
Morwyn - The Golden Dawn
Aristotle - On The Soul
William Godwin - The Lives Of The Necromancers