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Bhagavad-gītā  As It Is
[Ch. 8 .
but there is no recognized institution where students can be educated in the  brahmacārī  principles. Unless one practices celibacy, advancement in spiritual life is very difficult. Therefore Lord Caitanya has announced, according to the scriptural injunctions for this age of Kali, that no process of realizing the Supreme is possible except the chanting of the holy name of Lord Kṛṣṇa: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare.
TEXT 12
सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च । मूर्ध्याधायात्मनः प्राणमास्थितो योगधारणां ॥१२॥
sarva-dvārāṇi saṁyamya mano hṛdi-nirudhya ca mūrdhny ādhāyātmanaḥ prāṇam āsthito yoga-dhāraṇāṁ
sarva-dvārāṇi —all the doors of the body;  saṁyamya —controlling;  manaḥ —mind;  hṛdi —in the heart;  nirudhya —confined;  ca —also;  mūrdhni —on the head;  ādhāya —fixed;  ātmanaḥ —soul;  prāṇam —the life air;  āsthitaḥ —situated;  yoga-dhāraṇām —the yogic situation.
TRANSLATION
The yogic situation is that of detachment from all sensual engagements. Closing all the doors of the senses and fixing the mind on the heart and the life air at the top of the head, one establishes himself in yoga.
PURPORT
To practice  yoga , as suggested here, one first has to close the door of all sense enjoyment. This practice is called  pratyāhāra , or withdrawing the senses from the sense objects. Sense organs for acquiring knowledge, such as the eyes, ears, nose, tongue and touch, should be fully controlled and should not be allowed to engage in self-gratification. In this way the mind focuses on the Supersoul in the heart and the life force is raised to the top of the head. In the Sixth Chapter this process is described in detail. But as mentioned before, this practice is not practical in this age. The best process is  Kṛṣṇa  consciousness. If one is always able to fix his mind on