Text 13-14-1
Տեղուկի կա-կոջու
২໑1
prasāntātmā vigata-bhīr brahmacāri-vrate sthitaḥ manaḥ saṁyamya mac-citto vulkta 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.
TRANSLATION
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.
PURPORT
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-mūrti is uselessly engaged in mock- yoga  practice and is certainly wasting his time. Kṛṣṇa is the ultimate goal of life, and the Viṣṇu-mūrti situated in one's heart is the object of  yoga  practice. To realize this Viṣṇu-mūrti 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:
karmaņā manasā vācā sarvāvasthāsu sarvadā sarvatra maithuņa-tyāgo brahmacaryaṁ pracakṣate.