What is the importance of chanting mantras?

Question: What is the importance of chanting mantras?

Sri Sri Ravi Shankar: When someone abuses you verbally, how do you feel? 

If someone says that you are a donkey, how do you feel? What does it do to you? What does it create? Anger! It shakes you. It creates some negative vibrations; you feel angry. You feel some sensations in the stomach, the head. 

If a bad word can create so much physiological reactions in you, do you think a very sweet name, a chanting, which includes a lot of energy of the cosmos, does not do anything to your body? 

It is unscientific and stupid to think that a mantra does not do anything to your body. That is not the case! It does. 

Mantras bring out all the positive energy inside you. It is called mantra kavach; a mantra creates an armor around your body.