|Canto 3: The Status Quo||Chapter 28: Kapila's Instructions on the Execution of Devotional Service|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 3.28.10
mano 'cirāt syād virajaḿ
vāyv-agnibhyāḿ yathā lohaḿ
dhmātaḿ tyajati vai malam
manaḥ — the mind; acirāt — soon; syāt — can be; virajam — free from disturbances; jita-śvāsasya — whose breathing is controlled; yoginaḥ — of the yogī; vāyu-agnibhyām — by air and fire; yathā — just as; loham — gold; dhmātam — fanned; tyajati — becomes freed from; vai — certainly; malam — impurity.
The yogīs who practice such breathing exercises are very soon freed from all mental disturbances, just as gold, when put into fire and fanned with air, becomes free from all impurities.
This process of purifying the mind is also recommended by Lord Caitanya; He says that one should chant Hare Kṛṣṇa. He says further, paraḿ vijayate: "All glories to Śrī Kṛṣṇa sańkīrtana!" All glories are given to the chanting of the holy names of Kṛṣṇa because as soon as one begins this process of chanting, the mind becomes purified. Ceto-darpaṇa-mārjanam: [Cc. Antya 20.12] by chanting the holy name of Kṛṣṇa one is cleansed of the dirt that accumulates in the mind. One can purify the mind either by the breathing process or by the chanting process, just as one can purify gold by putting it in a fire and fanning it with a bellows.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness