Law of Resonance
The Law of Resonance works in collaboration with the Law of Attraction, based on a person's emotions, which dictates one's frequency and vibration.
For example, if a person is experiencing a health affliction or challenged with their health, and the dominant thoughts are of a negative nature, such as anger, bitterness, resentment, not releasing and unforgiving, anxiety, frustration, depression, sadness, grief and more, it is a very difficult task to heal from within, whatever is troubling the person.
The Law of Resonance will match a person's vibration. When one is holding onto negative thoughts for whatever reason, by the Law of Attraction, like attracts like, a person will solicit more of those thoughts.
Giving gratitude for anything one is grateful for is a rapid way to raise a person's vibration.