The sound vibration of the Hare Krishna mantra, although presented in the ordinary alphabet, should not be taken as mundane or material.
Srimad bhagavatam 4.9.4,
Material world brings pleasure and miseries.
Everything in Material world is temporary.
Everything is resting on Krishna, and everything is Krishna, but this is not to be realized by persons on the material platform.
Srimad Bhagavatam 10.10.32,
There are so many dangers in life because the material world is a place of danger.
This material world is a prison house for the spirit soul, to escape from here, chant the holy names of the Lord.