Accept what is, let go of what was, and have faith in what will be.
By accepting what is; and letting go of what was; and then having faith in what will be, you are giving yourself the opportunity to have a happy and fulfilling life. By not accepting what has become of your life, you hang on to the past, the anger, the hurt and the disappointment. By not letting go of the past, the anger, the hurt and the disappointment you are bringing it into your present. By not having faith in what will be you bring the past, the anger, the hurt and the disappointment into your future. If you bring your past into your future you will surely make the same mistakes.
