300
Śrīmad-Bhāgavatam
[Canto 5, Ch. 20]
antaḥ-praviśya —entering within;  bhūtāni —all living entities;  yaḥ —who;  bibharti —maintains;  ātma-ketubhiḥ —by the functions of the inner airs ( prāṇa, apāna, etc. );  antaryāmī —the Supersoul within;  iśvaraḥ —the Supreme Person;  sākṣāt —directly;  pātu —please maintain;  naḥ —us;  yat-vaśe —under whose control;  sphuṭam —the cosmic manifestation.
TRANSLATION
[The inhabitants of Śākadvīpa worship the Supreme Personality of Godhead in the form of Vāyu in the following words.] O Supreme Person, situated as the Supersoul within the body, You direct the various actions of the different airs, such as  prāṇa , and thus You maintain all living entities. O Lord, O Supersoul of everyone, O controller of the cosmic manifestation under whom everything exists, may You protect us from all dangers.
PURPORT
Through the mystic  yoga  practice called  prāṇāyāma , the  yogī  controls the airs within the body to maintain the body in a healthy condition. In this way, the  yogī  comes to the point of trance and tries to see the Supersoul within the core of his heart.  Prāṇāyāma  is the means to attain  samādhi , trance, in order to fully absorb oneself in seeing the Supreme Lord as  antrayāmī , the Supersoul within the core of the heart.
TEXT 29
एवमेव दधिमण्डोदात्परतः पुष्करद्वीपस्तते द्विगुणायामः समन्तत उपकल्पितः समानेन स्वादूदकेन समुद्रेण बहिरावृतो यस्मिन् बृहत्पुष्करं ज्वलनशिखामलकनकपत्रायुतायुतं भगवतः कमलासनस्याध्यासनं परिकल्पितम् ॥२९॥
evam eva dadhi-maṇḍodāt parataḥ puṣkaradvīpas tato dvi- guṇāyāmaḥ samantata upakalpitaḥ samānena svādūdakena samudreṇa bahir āvṛto yasmin bṛhat-puṣkaram jvalana-śikhāmala-kanaka- patrāyutāyutam bhagavataḥ kamalāsanasyādhyāsanam parikalpitam.