Mantra and Prana
A mantra is not sound, but in fact the origin of sound. And sound originates from radiating energy. So we can say that radiating energy is the source of sound. Sound can create good or bad energy. Sound can create wars or stop wars. Sound can make you happy or unhappy. When someone tells you good things you are happy, and when someone shouts you are unhappy. It can be a blessing as well as a curse. The way in which you utilize and filter sound determines how it will influence prana.