From what my teachers told me in India, the word "mantra" comes from the Sanskrit words "man" mind, and "trayate" to free. A mantra is used to free the mind. I have been chanting a specific mantra for some years, more so in my youth on japa mala, or 108 chanting beads for two hours a day. It certainly assists in freeing the mind from the negative self-talk and aids in focus. Thank you for a lovely post.