The Soul is repository of information that we gather during a lifetime.
There is nothing absolute and final. If everything were ironclad, all the rules absolute and everything structured so no paradox or irony existed, you couldn't move. One could say that man sneaks through the crack where paradox exists.
If we were to ask the brain how it would like to be treated, whether shaken at a random, irregular rate, or in a rhythmic, harmonious fashion, we can be sure that the brain, or for that matter the whole body, would prefer the latter.