do you mean that NAAM SMARAN done with right approach does work?this is put up as you put weight on words-NAAD BRAHM
Word fire does not create fire. Naam can work only if spontaneous, full love to God, desiring only God and and there is full Spiritual power.
If spontaneous the mind does not get tired
And it should never be mechanical like people are after they listen to Kirtan. The mind like a stupid idiot keeps reciting. That is not naam smaran
Bhavin