There are vibrations that exist everywhere. It is only vibrations when you go into it. Where there is vibration there is also sound. When we do these Mantras, the sounds we utter activate these special vibrations that will create a certain atmosphere or effects. Then the desired results are realized. These vibrations exist for everything, so anything can be activated, controlled or changed by Mantras. When one utters the Mantra with a pure mind into the Agnihotra pyramid at Agnihotra time, the ash retains that energy and the healing properties of the ash become more powerful.