Existence is energy moved around and expressed through will.
Terence Mckenna says "We tend to disempower ourselves. We tend to believe that we don't matter and in the act of taking that idea to ourselves, we give everything away to somebody else, to something else."
The idea here is that by submitting your will to something you don't actually want to do (i.e you want to quit smoking but you're tempted to smoke a cigarette), you're actually manifesting the opposite of your free will's real intention.
The basis is this. If you don't use your will, you don't exist. If you don't take matter into your own hands (see that beautiful expression?), you aren't actually contributing to existence.