Though as physical as our reality may seem, it is merely energy that creates our world - that creates us.
Everyone knows they have a physical body, but most people are yet to know we also have an energetic body. And beyond that lies an energetic field that surrounds our body. This is referred to as an aura. It can attract and dispel energy—and the idea is, is that the clearer your aura, the more attractive you are to bringing forth more positive energy into your life.
If we are holding unwanted energy in our energetic body or field, we will feel physical stress not only in our body and will in turn attract more in our outer reality. Which is why it is important to have a practice to keep your body and your aura clear, so life can bring to us that which we truly desire.