Chanting the mantra, the sacred seed letter (beejakshara) without concentration, grants only 20% benefit. Mantra chanted with concentration showers 80% benefit. The day you become fully silent you get 100% benefit.

Doing japa (mantra chanting) without concentration is only a drama. I permit this type of drama with the hope that one day it brings change in the person. While singing bhajans bend your head a little or close your eyes. It helps you reach the other plane.

(Q&A Session Trinidad)