The Superexcellent Power of Krṣṇa
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the pastimes of Lord Krṣṇa because the horses of Krṣṇa are not ordinary. It is not possible for ordinary horses to go all over the universe and then enter into its outer covering layers. As Krṣṇa is transcendental, similarly His chariot and His horses and everything about Him are also transcendental, beyond the qualities of this material world. We should always remember that Krṣṇa was playing the part of an ordinary human being, and His horses also, by the will of Krṣṇa, played the parts of ordinary horses in hesitating to enter the darkness.
Krṣṇa is known as Yogeśvara, as is stated in the last portion of  Bhagavad-gītā .  Yogeśvara Hari : all mystic powers are under His control. In our experience, we can see many human beings who have yogic mystic power. Sometimes they perform very wonderful acts, but Krṣṇa is understood to be the master of all mystic power. Therefore, when He saw that His horses were hesitant to proceed into the darkness, He immediately released His disc, known as the Sudarśana cakra, which illuminated the sky a thousand times brighter than sunlight. The darkness of the covering of the universe is also a creation of Krṣṇa's, and the Sudarśana cakra is Krṣṇa's constant companion. Thus the darkness was penetrated by His keeping the Sudarśana cakra in front.  Śrīmad-Bhāgavatam  states that the Sudarśana cakra penetrated the darkness just as an arrow released from the Śārṅga bow of Lord Rāmacandra penetrated the army of Rāvaṇa.  Su  means very nice, and  darśana  means observation; by the grace of Lord Krṣṇa's disc, Sudarśana, everything can be seen very nicely, and nothing can remain in darkness. Thus Lord Krṣṇa and Arjuna crossed over the great region of darkness covering the material universes.
Arjuna then saw the effulgence of light known as the  brahmajyoti . The  brahmajyoti  is situated outside the covering of the material universes, and because it cannot be seen with our present eyes, this  brahmajyoti  is sometimes called  avyakta . This spiritual effulgence is the ultimate destination of the impersonalists known as Vedāntists. The  brahmajyoti  is also described as  anantapāram , unlimited and unfathomed. When Lord Krṣṇa and Arjuna reached this region of the  brahmajyoti , Arjuna could not tolerate the glaring effulgence, and he closed his eyes. Lord Krṣṇa's and Arjuna's reaching the  brahmajyoti  region is described in  Harivaṁśa . In that portion of the Vedic literature, Krṣṇa informed Arjuna, "My dear Arjuna, the glaring effulgence, the transcendental light which you are seeing, is My bodily rays. O chief of the descendants of Bharata, this  brahmajyoti  is Myself." As the sun disc and the sunshine cannot be separated, similarly Krṣṇa and His bodily rays, the  brahmajyoti , cannot be separated. Thus Krṣṇa claimed that the  brahmajyoti  is He Himself. This is clearly stated in