Running with my previous question, if I believe in something enough, does that make it a reality?  Well if I wish hard enough and believe that if I went out to my driveway right now that there will be a Porsche waitng for me, I bet there wouldn't be.  So where are the boundaries of this?  I know that my reality is what I make of it, if I think I am pretty, well in part I can look in the mirror and see a pretty girl looking back; just like the power of the mind can convince a person that they can run a marathon.  But similar to the Porsche that wont be in my driveway when I next look, my body might not be capable of running that marathon no matter how hard I believe I can.  My point being that there seems to be an overriding set of rules, or boundaries at least to the reality of perception.  Some say that everything is an illusion, including my body, the keyboard I am typing on and the tension that I feel in my back right now; but how can that be?  If this was an illusion I would certainly be changing a few things, although what I don't know. There must be some principles that personal illiusion, reality, perception and belief can't change; some guiding principles that make this supposed illusion what it is... I can't walk through walls, I can't fly and I can wish a porsche to arrive in my driveway; just as much as I can't run a marathon without training and being capable first.