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Śrīmad-Bhāgavatam
[Canto 10, Ch. 2]
confirmed in  Bhagavad-gītā  (13.3):  kṣetra-jñam cāpi mām viddhi sarva-kṣetreṣu bhārata . Lord Kṛṣṇa is the  kṣetra-jña , or Supersoul, of all living entities. He is the original source of all expansions of the Personality of Godhead. There are hundreds and thousands of plenary expansions of Viṣṇu, such as Saṅkarṣaṇa, Pradyumna, Aniruddha and Vāsudeva, but here in this material world, the Viśvātmā, the Supersoul for all living entities, is Kṣīrodakaśāyī Viṣṇu. As stated in  Bhagavad-gītā  (18.61),  īśvaraḥ sarva-bhūtānām hṛd-deśe 'rjuna tiṣṭhati : “The Supreme Lord is situated in the heart of all living entities, O Arjuna.” Kṛṣṇa is actually Viśvātmā by His plenary expansion as  viṣṇu-tattva , yet because of His affection for His devotees, He acts as Supersoul to give them directions ( sarvasya cāham hṛdi sanniviṣṭo mattaḥ smṛtir jñānam apohanam ca ).
The affairs of the Supersoul pertain to Kṣīrodakaśāyī Viṣṇu, but Kṛṣṇa took compassion on Devakī, His devotee, because He understood her fear of Kaṅsa’s persecution. A pure devotee is always fearful of material existence. No one knows what will happen next, for one may have to change his body at any moment ( tathā dehāntara-prāptiḥ ). Knowing this fact, a pure devotee acts in such a way that he will not have his life spoiled by being obliged to accept another body and undergo the tribulations of material existence. This is  bhayam , or fear.  Bhayam dvitīyābhiniveśataḥ syāt  ( Bhāg.  11.2.37). This fear is due to material existence. Properly speaking, everyone should always be alert and fearful of material existence, but although everyone is prone to be affected by the ignorance of material existence, the Supreme Personality of Godhead, Kṛṣṇa, is always alert to the protection of His devotees. Kṛṣṇa is so kind and affectionate toward His devotees that He helps them by giving them the intelligence by which to exist in this material world without forgetting Him even for a moment. The Lord says:
teṣām evānukampārtham aham ajñānajam tamaḥ nāśayāmy ātma-bhāvastho jñāna-dīpena bhāsvatā
“Out of compassion for them, I, dwelling in their hearts, destroy with the shining lamp of knowledge the darkness born of ignorance.” (Bg. 10.11)