This Universal law basically states that the universe will always rearrange itself such that your outer world is a reflection of your inner world. Hence, eventually your thoughts (inner wolrd) create your reality (outer world). As within, so without. The best part of this Universal Law is that it works both ways. That is, you can change your inner world by changing your outer world. For instance, if your mind is cluttered and filled with disorgainsed thoughts you can calm it down by clearing your physical space or retreating to a quiet, peaceful place. We have all done this. Similarly, if you struggle to shed outdated thoughts, beliefs and fears you can make the process easier by first getting rid of outdated things in your physical, outer world.