Its a big subject when you think that something as small as a thought can effect your whole system.
Its like when you know something but cant remember what it is; no matter how hard you try to remember it. Its only when you give up and go and concentrate on something else is when your mind has the space to work and then when you are doing something else the answer pops into your head and you say "OH yeah"! why the hell couldnt I think of that when I needed it!

Your mind needed to be given the space to work.