Krishna is identical with His name. That means that His name has the same qualities as Himself, i.e. sat, chit, ananda. No mundane vibration is eternal, otherwise why does it grow tiresome and have to be changed every other week. Nor do mundane songs produce real knowledge or bliss unending. Also, this transcendental vibration purifies one. Anyone can see practically how our students are becoming purified, but the chanters of material songs are not.
Letter to Hayagriva, 26 September, 1970