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Śrīmad-Bhāgavatam
[Canto 5, Ch. 11]
place of everything material. He is therefore known as Vāsudeva, the Supreme Personality of Godhead. By His own potency, He is present within the hearts of all living entities, just as the air or vital force is within the bodies of all beings, moving and nonmoving. In this way He controls the body. In His partial feature, the Supreme Personality of Godhead enters all bodies and controls them.
PURPORT
This is confirmed in  Bhagavad-gītā  (15.15).  Sarvasya cāhaṁ hṛdi sanniviṣṭo mattaḥ smṛtir jñānam apohanaṁ ca . Every living being is controlled by the supreme living being, Paramātmā, who resides within everyone's heart. He is the  puruṣa , the  puruṣa-avatāra , who creates this material world. The first  puruṣa-avatāra  is Mahā-Viṣṇu, and that Mahā-Viṣṇu is the plenary portion of the plenary portion of the Supreme Personality of Godhead, Kṛṣṇa. Kṛṣṇa's first expansion is Baladeva, and His next expansions are Vāsudeva, Saṅkarṣaṇa, Aniruddha and Pradyumna. Vāsudeva is the original cause of the  brahmajyoti , and the  brahmajyoti  is the expansion of the rays of the body of Vāsudeva.
yasya prabhā prabhavato jagad-aṇḍa-koṭi- koṭiṣv aśeṣa-vasudhādi-vibhūti-bhinnam tad brahma niṣkalam anantam aśeṣa-bhūtaṁ govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"I worship Govinda, the primeval Lord, who is endowed with great power. The glowing effulgence of His transcendental form is the impersonal Brahman, which is absolute, complete and unlimited and which displays the varieties of countless planets, with their different opulences, in millions and millions of universes." ( Brahma-saṁhitā  5.40) The Supreme Personality of Godhead is thus described in  Bhagavad-gītā :
mayā tatam idaṁ sarvaṁ jagad avyakta-mūrtinā mat-sthāni sarva-bhūtāni na cāhaṁ teṣv avasthitaḥ