Guest (1): Is it possible for us to know the source of Kṛṣṇa?
Devotee: "Is it possible to know the source of Kṛṣṇa?"
Prabhupāda: Source of Kṛṣṇa? Well, Kṛṣṇa is the origin. Sarva-kāraṇa-kāraṇam (Bs. 5.1). We are trying to understand the source of Kṛṣṇa because we have no other experience. We have got only experience that everything has got a cause, source. You go on searching out. Just like you are caused by your father. Your father is caused by his father. His father is cause of . . . in this way go on researching, researching, then you come to Brahmā, the original person in this universe.
Then Brahmā is also caused by Garbhodakaśāyī Viṣṇu. The Garbhodakaśāyī Viṣṇu is caused by Kāraṇodakaśāyī Viṣṇu. The Kāraṇodakaśāyī Viṣṇu is caused by Saṅkarṣaṇa. Saṅkarṣaṇa is caused by Nārāyaṇa. Nārāyaṇa caused by Baladeva. Baladeva is caused by Kṛṣṇa. Therefore Kṛṣṇa is the origin, cause, of everyone. He has no cause. He has no source. He is the original source of everything. Ahaṁ sarvasya prabhavaḥ (BG 10.8): "I am the source of everything." And Brahmā-saṁhitā, sarva-kāraṇa-kāraṇam (Bs. 5.1): "The cause of all causes."
So Supreme Lord is the cause of all causes, but He is not caused by anyone. That is His supremacy. He is not caused by everyone. He is svarāṭ. He is described in the Vedic, svarāṭ, "self-evident." That is God.