Breathing is far more important than we realize. Its benefits on the physical and mental planes are innumerable; relaxing the mind, regulating hormones, mental clarity, and greater awareness. But it is the spiritual purpose of the breath that is most significant.
If you could see energies, you would see little black hooks that shoot out from people with negative thought forms and hook into your auric field. These hooks suck your good, happy energy right out of you leaving you drained and miserable. Imagine this happening several times a day. Without proper protection, you leave yourself open for psychic attack and unwanted negative thoughts.