The Holy Names Are Cintamani - Spiritual - Prabhupada 0900
730908 - Lecture BG 07.01 at Uppsala University - Stockholm
Nāma cintāmaṇiḥ kṛṣṇa caitanya-rasa-vigrahaḥ pūrṇaḥ. Complete. Not that one percent less than Kṛṣṇa. No. Cent percent Kṛṣṇa. Complete. Pūrṇa. Pūrṇa means complete. Pūrṇaḥ śuddhaḥ. Śuddha means purified. There is contamination in the material world. Material, any name you chant, because it is materially contaminated, you cannot continue it for very long. This is another experience. But this chanting of Hare Kṛṣṇa mantra, if you go on chanting for twenty-four hours, you'll never feel fatigued. That is the test. You go on chanting.
These boys can chant twenty-four hours, without eating anything, without drinking water. It is so nice. Because it is complete, spiritual, śuddha. Śuddha means pure. Not materially contaminated.