As confirmed in the Bhagavad-gītā (10.9):
mac-cittā mad-gata-prāṇā
bodhayantaḥ parasparam
kathayantaś ca māṁ nityaṁ
tuṣyanti ca ramanti ca
The Supreme Lord is unlimited, and His energies are also unlimited. No one can know them completely. Brahmājī, being the greatest living entity within this universe and being directly instructed by the Lord, must know more than anyone within this universe, although such knowledge may not be complete. Thus it is the duty of everyone to ask about the unlimited Lord from the spiritual master in the disciplic succession of Brahmā, which descends from Nārada to Vyāsa, from Vyāsa to Śukadeva and so on.
(Srimad Bhagavatam------2:9:42------purport).

The prāṇa-vāyu continues the life, and the apāna-vāyu stops the living force. Both the vibrations are generated from the abdominal hole, the navel. This navel is the joint from one body to the other. Lord Brahmā was born of the abdominal hole of Garbhodakaśāyī Viṣṇu as a separate body, and the same principle is followed even in the birth of any ordinary body. The body of the child develops from the body of the mother, and when the child is separated from the body of the mother, it is separated by cutting the navel joint. And that is the way the Supreme Lord manifested Himself as separated many. The living entities are therefore separated parts, and thus they have no independence.
(Srimad Bhagavatam------2:10:28------purport).

Consciousness is the sign of the living entity, or the soul. The existence of the soul is manifest in the form of consciousness, called jñāna-śakti. The total consciousness is that of the gigantic virāṭ-rūpa, and the same consciousness is exhibited in individual persons. The activity of consciousness is performed through the air of life, which is of ten divisions. The airs of life are called prāṇa, apāna, udāna, vyāna and samāna and are also differently qualified as nāga, kūrma, kṛkara, devadatta and dhanañjaya.
(Srimad Bhagavatam------3:6:7------purport).

This desire was also expressed by King Kulaśekhara in his Mukunda-mālā-stotra:
kṛṣṇa tvadīya-padapaṅkaja-pañjarāntam
adyaiva me viśatu mānasa-rāja-haṁsaḥ
prāṇa-prayāṇa-samaye kapha-vāta-pittaiḥ
kaṇṭhāvarodhana-vidhau smaraṇaṁ kutas te
(MM 33)
King Kulaśekhara wanted to give up his body while in a healthy state, and he thus prayed to Kṛṣṇa to let him die immediately while he was in good health and while his mind was sound. When a man dies, he is generally overpowered by mucus and bile, and thus he chokes. Since it is very difficult to vibrate any sound while choking, it is simply by Kṛṣṇa's grace that one can chant Hare Kṛṣṇa at the time of death. However, by situating oneself in the muktāsana position, a yogī can immediately give up his body and go to whatever planet he desires. A perfect yogī can give up his body whenever he desires through the practice of yoga.
(Srimad Bhagavatam------4:23:13------purport).

Indeed, being the life air of every living entity, the Lord is the maintainer of the three worlds. Consequently He can induce every living entity to engage in his real life's duty with full bodily and mental strength. Thus every living entity should serve the Supreme Personality of Godhead by his prāṇa (life), artha (wealth), intelligence and words.
(Srimad Bhagavatam------4:24:39------purport).

When one is sleeping, the life air remains active in different dreams. The five hoods of the snake indicate that the life air is surrounded by five kinds of air, known asprāṇa, apāna, vyāna, udāna and samāna. When the body is inactive, the prāṇa, or the life air, is active. Up to the age of fifty one can actively work for sense gratification, but after the fiftieth year one's energy decreases, although one can with great strain work for two or three more years—perhaps up to the fifty-fifth year.
(Srimad Bhagavatam------4:27:15------purport).

Within the material world, one's material body is always subject to birth and decay. Similarly, the life air (prāṇa) is harassed by hunger and thirst, the mind is always anxious, the intelligence hankers for that which cannot be obtained, and all of the senses are ultimately exhausted by constant struggle in the material nature. A person who is not bewildered by the inevitable miseries of material existence, and who remains aloof from them simply by remembering the lotus feet of the Supreme Personality of Godhead, is to be considered bhāgavata-pradhāna, the foremost devotee of the Lord.
(Srimad Bhagavatam------11:2:49------translation).

The spirit soul is born in many different species of life within the material world. Some species are born from eggs, others from embryos, others from the seeds of plants and trees, and others from perspiration. But in all species of life the prāṇa, or vital air, remains unchanging and follows the spirit soul from one body to another. Similarly, the spirit soul is eternally the same despite its material condition of life. We have practical experience of this. When we are absorbed in deep sleep without dreaming, the material senses become inactive, and even the mind and false ego are merged into a dormant condition. But although the senses, mind and false ego are inactive, one remembers upon waking that he, the soul, was peacefully sleeping.
(Srimad Bhagavatam------11:3:39------translation).

From the Ananta-saṁhitā:
ya eva bhagavān kṛṣṇo
rādhikā-prāṇa-vallabhaḥ
sṛṣṭy ādau sa jagan-nātho
gaura āsīn maheśvari
"The Supreme Person, Śrī Kṛṣṇa Himself, who is the life of Śrī Rādhārāṇī and is the Lord of the universe in creation, maintenance and annihilation, appears as Gaura, O Maheśvarī."
(Sri Caitanya Caritamrta------1:2:22-----purport).

Elsewhere in Śrīmad-Bhāgavatam (10.63.26) the ingredients and cause of the material cosmic manifestation are described as follows:
kālo daivaṁ karma jīvaḥ svabhāvo
dravyaṁ kṣetraṁ prāṇa ātmā vikāraḥ
tat-saṅghāto bīja-roha-pravāhas
tvan-māyaiṣā tan-niṣedhaṁ prapadye
"O my Lord! Time, activity, providence and nature are four parts of the causal aspect (māyā) of the external energy. The conditioned vital force, the subtle material ingredients called the dravya, and material nature (which is the field of activity where the false ego acts as the soul), as well as the eleven senses and five elements (earth, water, fire, air and ether), which are the sixteen ingredients of the body—these are the ingredient aspect of māyā. The body is generated from activity, and activity is generated from the body, just as a tree is generated from a seed that is generated from a tree. This reciprocal cause and effect is called māyā. My dear Lord, You can save me from this cycle of cause and effect. I worship Your lotus feet."
(Sri Caitanya Caritamrta------1:5:58-----purport).

In the Muṇḍaka Upaniṣad (3.1.9) the measurement of the atomic spirit soul is further explained:
eṣo 'ṇur ātmā cetasā veditavyo
yasmin prāṇaḥ pañcadhā saṁviveśa
prāṇaiś cittaṁ sarvam otaṁ prajānāṁ
yasmin viśuddhe vibhavaty eṣa ātmā
"The soul is atomic in size and can be perceived by perfect intelligence. This atomic soul is floating in the five kinds of air (prāṇa, apāna, vyāna, samāna and udāna), is situated within the heart, and spreads its influence all over the body of the embodied living entities. When the soul is purified from the contamination of the five kinds of material air, its spiritual influence is exhibited."
(Bhagavad-Gita-------2:17------purport).

The senses interact with the sense objects, like the ear for hearing, eyes for seeing, nose for smelling, tongue for tasting, hand for touching, and all of them are thus engaged in activities outside the self. They are called the functions of the prāṇa-vāyu. The apāna-vāyu goes downwards, vyāna-vāyu acts to shrink and expand, samāna-vāyu adjusts equilibrium, udāna-vāyu goes upwards—and when one is enlightened, one engages all these in searching for self-realization.
(Bhagavad-Gita-------4:27------purport).

This system of yoga for controlling the breathing process is called prāṇāyāma, and in the beginning it is practiced in the haṭha-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 apāna air goes downward, and theprāṇa air goes up. The prāṇāyāma-yogī practices breathing the opposite way until the currents are neutralized into pūraka. equilibrium.
(Bhagavad-Gita-------4:29------purport).

The Vedānta-sūtra also describes the Supreme by saying, ānanda-mayo 'bhyāsāt: the Supreme Personality of Godhead is by nature full of joy. To enjoy His transcendental bliss, He expands into vijñāna-maya, prāṇa-maya, jñāna-maya and anna-maya. In the field of activities the living entity is considered to be the enjoyer, and different from him is the ānanda-maya. That means that if the living entity decides to enjoy in dovetailing himself with the ānanda-maya, then he becomes perfect.
(Bhagavad-Gita-------13:5------purport).