My attitude goes back to my childhood. I used to audition for theatrical roles, and you can't stand out in a room full of ambitious eight-year-old girls by acting the wallflower. I realised then that I couldn't do things half-heartedly.
We must become masters of our own actions and attitudes. To let another person determine whether we will be rude or gracious, elated or depressed is to give control of ourselves. The only true possession is self possession.
Our humble service attitude in our life is what determines what effect chanting will have on our consciousness. Otherwise we can be chanting for millions and millions of births before we actually achieve the goal.