सर्वद्वाराणि संयम्य मनो हृदि निरुध्य च । मूर्ध्न्याधायात्मनः प्राणमास्थितो योगधारणाम् ॥१२॥
sarva-dvārāṇi saḿyamya mano hṛdi nirudhya ca mūrdhny ādhāyātmanaḥ prāṇam āsthito yoga-dhāraṇām
sarva-dvārāṇi — all the doors of the body; saṁyamya — controlling; manaḥ — the mind; hṛdi — in the heart; nirudhya — confining; ca — also; mūrdhni — on the head; ādhāya — fixing; ātmanaḥ — of the soul; prāṇam — the life air; āsthitaḥ — situated in; yoga-dhāraṇām — the yogic situation.
Restraining all the gates of the body and fixing the mind in the heart region, and then drawing the life-breath to the head, one should get established in steadfast yogic concentration.
To practice yoga as suggested here, one first has to close the doors of all sense enjoyment. This practice is called pratyāhāra, or withdrawing the senses from the sense objects. The sense organs for acquiring knowledge – 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 Kṛṣṇa in devotional service, it is very easy for him to remain in an undisturbed transcendental trance, or in samādhi.