It may seem like common sense, however, when you are going through recovery and trying to stay clean and/or sober, you need to believe in yourself. Even if everyone else is doubting you, you can overcome temptation, but you need to believe in yourself that you can do it. Picture yourself happy, clean, and sober. Believe that you can be that person. It may not happen over night, and it will take work, but it is worth doing. Believe in yourself.