The law of attraction says that you will attract into your life what you are thinking about. For example, you may want to get your ex back into your life. This is a major thing, but it can happen as long as you would think positively and allow your energy to do things that will make your ex come back. The manifestation may not always happen immediately.
It will depend not only on your thoughts but also your actions so that you can reach your goals. If you would stay focused on the positive things in your life, that is exactly what you will achieve. If you become too negative, then more negativity will enter your life.