"Whatever you habitually think yourself to be, that you are. You must form, now, a greater and better habit; you must form a conception of yourself as a being of limitless power, and habitually think that you are that being. It is the habitual, not the periodical thought that decides your destiny."
So if thoughts become things... it's those thoughts that you're always thinking, even without thinking, not the ones that just pop in for a quick visit. It's those thoughts, because you believe them... and chances are you believe them because of some experience. We have thoughts all the time that come and go, but when something happens that affects us, we tend to remember it more. When we do things, and begin to see results, good or bad, we tend to believe them. So, while you may have some thoughts that are silly at the time... it's what you do with them, that becomes believable.
Today's Silver Lining
"Ghosts in the photograph never lied to me. I'd be all of that. I'd be all of that. A false memory would be everything. A denial my eliminent." Take Me Somewhere Nice- by Mogwai