This law is basically just the law of cause and effect applied to the blessings that are given to us as a response to our deeds. These compensations are given to us in the form of money, gifts, friendships, etc.
Before you can receive this law, you need to break the poverty consciousness which comes from your conditioning in this lifetime. Look at the world as a place of abundance. There is plenty for everyone. We need to reprogram our thinking. Affirmations are a good way of doing this. Give more and you will receive more; right thoughts, emotions, actions, and words play a big role here.