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Krṣṇa, the Supreme Personality of Godhead
the  Harivamśa  when Krṣṇa says, “ aham saḥ .” The  brahmajyoti  is a combination of the minute particles known as spiritual sparks, or the living entities known as  citkana . The Vedic word  so'ham , or “I am the  brahmajyoti ,” can also be applied to the living entities, who can also claim to belong to the  brahmajyoti . In the  Harivamśa , Krṣṇa further explains, “This  brahmajyoti  is an expansion of My spiritual energy.”
Krṣṇa told Arjuna, “The  brahmajyoti  is beyond the region of My external energy, known as  māyā-śakti . When one is situated within this material world, it is not possible for him to experience this Brahman effulgence. Therefore, in the material world this effulgence is not manifested, whereas in the spiritual world, it is manifested. That is the purport of the words  vyakta-avyakta . In the  Bhagavad-gītā  it is said  avyakto-'vyaktāt sanātanaḥ : both these energies are eternally manifested.
After this, Lord Krṣṇa and Arjuna entered a vast extensive spiritual water. This spiritual water is called the Kāraṇārṇava Ocean or Virajā which means that this ocean is the origin of the creation of the material world. In the  Mṛtyuñjaya Tantra , a Vedic literature, there is a vivid description of this Kāraṇa Ocean, or Virajā. It is stated there that the highest planetary system within the material world is Satyaloka, or Brahmaloka. Beyond that there are Rudraloka and Mahā-Viṣṇuloka. Regarding this Mahā-Viṣṇuloka, it is stated in the  Brahma-samhitā ,  yaḥ kāraṇārṇava-jale bhajati sma yoga : “Lord Mahā-Viṣṇu is lying in the Kāraṇa Ocean. When He exhales, innumerable universes come into existence, and when He inhales, innumerable universes enter within Him.” In this way, the material creation is generated and again withdrawn. When Lord Krṣṇa and Arjuna entered the water, it appeared that there was a strong hurricane of transcendental effulgence brewing, and the water of the Kāraṇa Ocean was greatly agitated. By the grace of Lord Krṣṇa, Arjuna had the unique experience of being able to see the very beautiful Kāraṇa Ocean.
Accompanied by Krṣṇa, Arjuna saw a large palace within the water. There were many thousands of pillars and columns made of valuable jewels, and the glaring effulgence of those columns was so beautiful that Arjuna became charmed by it. Within that palace, Arjuna and Krṣṇa saw the gigantic form of Anantadeva, who is also known as Śeṣa. Lord Anantadeva or Śeṣanāga was in the form of a great serpent with thousands of hoods, and each one of them was decorated with valuable, effulgent jewels, which were beautifully dazzling. Each of Anantadeva’s hoods had two eyes which appeared to be very fearful. His body was as white as the mountaintop of Kailāsa, which is always covered by snow. His neck was bluish, as were His tongues. Thus Arjuna saw the Śeṣanāga form, and he