This law deals directly with your ability to command your subconscious mind. The subconscious mind cannot make a distinction between what is true and what is false. It simply does what it is told to do by the conscious mind.
The Universal Law of Substitution states that you can substitute any negative thought for a positive one in order to create a positive outcome for yourself.
Since the subconscious mind that creates our lives cannot tell the difference between what is true or what is false, you can change your reality by changing your thoughts (your conscious mind).
The law of substitution can be used to improve your mood, I know that most people are subject to mood swings and most are aware of the mood change when it is happening, you can use the law of substitution to turn that feeling around. I have found that when I feel my mood changing to one I find less desirable I can make the change just by saying to myself:
“I know this is a feeling I don’t want right now, so I am going to change it”.