Brian remembers how Mr.Perpich is telling him how to always stay positive and that you’re the best thing you have. Mr.Perpich means by that, that you’re your best thing no matter how you look or act. Positive thinking might help Brian stay confident instead of negative thinking that will stress him and make him loose his motivation. You have value in your brain and body that will help you do something if you have confidence in that you will be able to things other people without confidence can’t. Brian without motivation could just comet suicide and with confidence he would try to survive as long as possible. So just believe that you can do it and if you never give up you might be able to do that if you have confidence in yourself.