تاریخ انقلاب
Knowledge of the Absolute . . .
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they are unable to calculate Your energy and potency, although You are present before them.” The Supreme Personality of Godhead, Lord Kṛṣṇa, is not only unborn, but He is  avyaya , inexhaustible. His eternal form is bliss and knowledge, and His energies are all inexhaustible.
TEXT 26
वेदाहं समतीतानि वर्तमानानि चार्जुन । भविष्याणि च भूतानि मां तु वेद न कश्चन ॥२६॥
vedāhaṁ samatītāni  
 vartamānāni cārjuna  
 bhaviṣyāṇi ca bhūtāni  
 māṁ tu veda na kaścana
veda —know;  aham —I;  sama —equally;  atītāni —past;  vartamānāni —present;  ca —and;  arjuna —O Arjuna;  bhaviṣyāṇi —future;  ca —also;  bhūtāni —living entities;  mām —Me;  tu —but;  veda —knows;  na —not;  kaścana —anyone.
TRANSLATION
O Arjuna, as the Supreme Personality of Godhead, I know everything that has happened in the past, all that is happening in the present, and all things that are yet to come. I also know all living entities; but Me no one knows.
PURPORT
Here the question of personality and impersonality is clearly stated. If Kṛṣṇa, the form of the Supreme Personality of Godhead, is considered by the impersonalists to be  māyā , to be material, then He would, like the living entity, change His body and forget everything in His past life. Anyone with a material body cannot remember his past life, nor can he foretell his future life, nor can he predict the outcome of his present life; therefore he cannot know what is happening in past, present and future. Unless one is liberated from material contamination, he cannot know past, present and future.
Unlike the ordinary human being, Lord Krṣṇa clearly says that He