This system of yoga for controlling the breathing process is called pranayama, and in the beginning it is practiced in the hatha-yoga system through different sitting postures. All of these processes are recommended for controlling the senses and for advancement in spiritual realization. This practice involves controlling the airs within the body so as to reverse the directions of their passage. The apana air goes downward, and the prana air goes up. The pranayama-yogi practices breathing the opposite way until the currents are neutralized into puraka. equilibrium. Offering the exhaled breath into the inhaled breath is called recaka. When both air currents are completely stopped, one is said to be in kumbhaka-yoga. By practice of kumbhaka-yoga. one can increase the duration of life for perfection in spiritual realization. The intelligent yogi is interested in attaining perfection in one life, without waiting for the next. For by practicing kumbhaka-yoga. the yogis increase the duration of life by many, many years. A Krishna conscious person, however, being always situated in the transcendental loving service of the Lord, automatically becomes the controller of the senses. His senses, being always engaged in the service of Krishna, have no chance of becoming otherwise engaged. So at the end of life, he is naturally transferred to the transcendental plane of Lord Krishna; consequently he makes no attempt to increase his longevity. He is at once raised to the platform of liberation, as stated in Bhagavad-gita
Qualitatively, the small atomic fragmental part of the Supreme Spirit is one with the Supreme. He undergoes no changes like the body. Sometimes the soul is called the steady, or kuta-stha. The body is subject to six kinds of transformations. It takes its birth from the womb of the mother’s body, remains for some time, grows, produces some effects, gradually dwindles, and at last vanishes into oblivion. The soul, however, does not go through such changes. The soul is not born, but, because he takes on a material body, the body takes its birth. The soul does not take birth there, and the soul does not die. Anything which has birth also has death. And because the soul has no birth, he therefore has no past, present or future. He is eternal, ever-existing, and primeval — that is, there is no trace in history of his coming into being. Under the impression of the body, we seek the history of birth, etc., of the soul. The soul does not at any time become old, as the body does. The so-called old man, therefore, feels himself to be in the same spirit as in his childhood or youth. The changes of the body do not affect the soul. The soul does not deteriorate like a tree, nor anything material. The soul has no by-product either. The by-products of the body, namely children, are also different individual souls; and, owing to the body, they appear as children of a particular man. The body develops because of the soul’s presence, but the soul has neither offshoots nor change. Therefore, the soul is free from the six changes of the body
11.12, 5.7, 7.23
One who is on the path of liberation by Krishna consciousness is very dear to every living being, and every living being is dear to him. This is due to his Krishna consciousness. Such a person cannot think of any living being as separate from Krishna, just as the leaves and branches of a tree are not separate from the tree. He knows very well that by pouring water on the root of the tree, the water will be distributed to all the leaves and branches, or by supplying food to the stomach, the energy is automatically distributed throughout the body. Because one who works in Krishna consciousness is servant to all, he is very dear to everyone. And because everyone is satisfied by his work, he is pure in consciousness. Because he is pure in consciousness, his mind is completely controlled. And because his mind is controlled, his senses are also controlled. Because his mind is always fixed on Krishna, there is no chance of his being deviated from Krishna. Nor is there a chance that he will engage his senses in matters other than the service of the Lord. He does not like to hear anything except topics relating to Krishna; he does not like to eat anything which is not offered to Krishna; and he does not wish to go anywhere if Krishna is not involved. Therefore, his senses are controlled. A man of controlled senses cannot be offensive to anyone.
Here the point may be raised that if the demigods are different parts of the body of the Supreme Lord, then the same end should be achieved by worshiping them. However, worshipers of the demigods are less intelligent because they don’t know to what part of the body food must be supplied. Some of them are so foolish that they claim that there are many parts and many ways to supply food. This isn’t very sanguine. Can anyone supply food to the body through the ears or eyes? They do not know that these demigods are different parts of the universal body of the Supreme Lord, and in their ignorance they believe that each and every demigod is a separate God and a competitor of the Supreme Lord.
The Vedas, like the Mundaka Upanishad, as well as the Svetasvatara Upanishad, compare the soul and the Supersoul to two friendly birds sitting on the same tree. One of the birds (the individual atomic soul) is eating the fruit of the tree, and the other bird (Krishna) is simply watching His friend. Of these two birds — although they are the same in quality — one is captivated by the fruits of the material tree, while the other is simply witnessing the activities of His friend. Krishna is the witnessing bird, and Arjuna is the eating bird. Although they are friends, one is still the master and the other is the servant. Forgetfulness of this relationship by the atomic soul is the cause of one’s changing his position from one tree to another, or from one body to another. The jiva soul is struggling very hard on the tree of the material body, but as soon as he agrees to accept the other bird as the supreme spiritual master — as Arjuna agreed to do by voluntary surrender unto Krishna for instruction — the subordinate bird immediately becomes free from all lamentations.