Text 33] Instructions for Civilized Human Beings
233
known as pūraka, kumbhaka and recaka—controlling inhalation and exhalation and then stopping them both. In this way the yogi restricts his mind from material attachments and gives up all mental desires. As soon as the mind, being defeated by lusty desires, drifts toward feelings of sense gratification, the yogi should immediately bring it back and arrest it within the core of his heart.
PURPORT
The practice of  yoga  is concisely explained herein. When this practice of  yoga  is perfect, one sees the Supersoul, the Paramātmā feature of the Supreme Personality of Godhead, within the core of one's heart. However, in  Bhagavad-gītā  (6.47) the Supreme Lord says:
yoginām api sarveṣām mad-gatenāntarātmanā śraddhāvān bhajate yo māṁ sa me yuktatamo mataḥ
“Of all  yogīs , he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in  yoga  and is the highest of all.” A devotee can immediately become a perfect  yogī  because he practices keeping Kṛṣṇa constantly within the core of his heart. This is another way to practice  yoga  easily. The Lord says:
man-manā bhava mad-bhakto mad-yājī māṁ namaskuru
“Always think of Me and become My devotee. Worship Me and offer your homage unto Me.” (Bg. 18.65) If one practices devotional service by always keeping Kṛṣṇa within the core of his heart ( man-manāḥ ), he immediately becomes a first-class  yogī . Furthermore, keeping Kṛṣṇa within the mind is not a difficult task for the devotee. For an ordinary man in the bodily concept of life, the practice of  yoga  may be helpful, but one who immediately takes to devotional service can immediately become a perfect  yogī  without difficulty.