I don't think the point is to do Good versus Evil or work to master our lives, or our reality. Really, we should accept what happens and accept that we do have power to change, but certain things in life we cannot master. Letting go a little to the restraints of life and coincidence (or fate, depending on how you look at it), help us better forge a sensible reality. Convincing ourselves that we can completely master our own realities is, in a way, a delusion. The reality is that we do not have complete power, but that is not to say that we don't have any - we still must be held accountable for our actions and their effects (usually), but we cannot delude ourselves with the fake reality of our total power (as in sources like The Secret). While we should accept that the mind is a powerful tool, it can't stop disease just by wishing it so.