Power of Chanting RAMA NAMA from an incident in Bhagava Ramana Maharshi's life .Though Bhagwan has not recommended any Mantra Japa and prefers to advise people to do self - enquiry yet when some one says they do "Rama Nama" Japa , he encourages them to continue and ask them not to change the mantra to Shiva , Arunachala Shiva etc .
This is the conversation between Bhagwan Ramana and Prof.N.R.Krishnamurti Aiyer
Pg.143 Power of Presence Part-1 by David Godman
"I prostrated before him and said ,"Bhagavan ,I am doing Rama Mantra Japa .Is not Arunachala Mantra Japa superior to this ?
"No!No!: said Bhagavan vehemently ."Both are identical . "Ra" means "that is" and "ma" means "thou" . "A" in Arunachala means "that" ,"ru" means "thou", and "na" means "art" .
Then he added ,"Using your mind as your mouth , let the name Rama revolve continuously like Vishnu's Chakra [ discus-like weapon] within your mind .No others need know that you are doing Japa" .
I interjected ,"If I spend all my time like that , what will happen to my teaching work? Will not my bread winning be in jeopardy ?"
Sri Bhagavan replied ,"The one whose name you repeat will take full charge of all that . Don't be concerned about it ".