I know you've heard every good tree bears good fruit and every bad tree bears bad fruit. It makes sense it's a pretty simple concept. This is also true with your mind. Remember you are what you think. If you think negative you'll bring negative into your life. If you think positive you'll bring the positive into your life. Look its not rocket science. If you want to be happy, think happy. If you think negative......well, I think you get it the point.