BG 6.13-14
समं कायशिरोग्रीवं धारयन्नचलं स्थिर: ।
सम्प्रेक्ष्य नासिकाग्रं स्वं दिशश्चानवलोकयन् ॥ १३ ॥
प्रशान्तात्मा विगतभीर्ब्रह्मचारिव्रते स्थित: ।
मन: संयम्य मच्चित्तो युक्त आसीत मत्पर: ॥ १४ ॥
samaṁ kāya-śiro-grīvaṁ
dhārayann acalaṁ sthiraḥ
samprekṣya nāsikāgraṁ svaṁ
diśaś cānavalokayan
praśāntātmā vigata-bhīr
brahmacāri-vrate sthitaḥ
manaḥ saṁyamya mac-citto
yukta āsīta mat-paraḥ
samam — straight; kāya-śiraḥ — body and head; grīvam — neck; dhārayan — holding; acalam — unmoved; sthiraḥ — still; samprekṣya — looking; nāsikā — nose; agram — tip; svam — own; diśaḥ — all sides; ca — also; anavalokayan — not seeing; praśānta — unagitated; ātmā — mind; vigata-bhīḥ — devoid of fear; brahmacāri-vrate — in the vow of celibacy; sthitaḥ — situated; manaḥ — mind; saṁyamya—completely subdued; mat — unto Me (Kṛṣṇa); cittaḥ — concentrated; yuktaḥ — actual yogī; āsīta — being so; mat — unto Me; paraḥ — ultimate goal.
One should hold one's body, neck and head erect in a straight line and stare steadily at the tip of the nose. Thus with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should meditate upon Me within the heart and make Me the ultimate goal of life.
The goal of life is to know Kṛṣṇa, who is situated within the heart of every living being as Paramātmā, the four-handed Viṣṇu form. The yoga process is practiced in order to discover and see this localized form of Viṣṇu, and not for any other purpose. The localized Viṣṇu - mūrti is the plenary representation of Kṛṣṇa dwelling within one's heart. One who has no program to realize this Viṣṇu - murti is uselessly engaged in mock- yoga practice and is certainly wasting his time. Kṛṣṇā is the ultimate goal of life, and the Viṣṇu - murti situated in one's heart is the object of yoga practice. To realize this Viṣṇu - murti within the heart, one has to observe complete abstinence from sex life; therefore one has to leave home and live alone in a secluded place, remaining seated as mentioned above. One cannot enjoy sex life daily at home or elsewhere and attend a so-called yoga class and thus become a yogī. One has to practice controlling the mind and avoiding all kinds of sense gratification, of which sex life is the chief. In the rules of celibacy written by the great sage Yājñavalkya it is said:
Vigatabhīḥ. One cannot be fearless unless one is fully in Kṛṣṇa consciousness. A conditioned soul is fearful due to his perverted memory, his forgetfulness of his eternal relationship with Kṛṣṇa. The Bhāgavatam says, bhayaṁ dvitīyābhiniveśataḥ syād īśād apetasya viparyayo 'smṛtiḥ: Kṛṣṇa consciousness is the only basis for fearlessness. Therefore, perfect practice is possible for a person who is Kṛṣṇa conscious. And since the ultimate goal of yoga practice is to see the Lord within, a Kṛṣṇa conscious person is already the best of all yogīs. The principles of the yoga system mentioned herein are different from those of the popular so-called yoga societies.