The soul is eternally distinct from the body; only Krishna knows all fields and all living entities within them.Listen — Srila Prabhupada Uvaca
Bhagavad-gītā 13.3 — August 11, 1973, Paris 730811BG-PARIS [40:56 Minutes] Bg-13.03_730811BG-PARIS Pradyumna: [leads chanting of verse] [Prabhupāda and devotees repeat] kṣetra-jñaṁ cāpi māṁ viddhi sarva-kṣetreṣu bhārata kṣetra-kṣetrajñayor jñānaṁ yat taj jñānaṁ mataṁ mama [Bg. 13.3] [break] [leads chanting of synonyms] kṣetrajñam—the knower; ca—also; api—certainly; mām—Me; viddhi—know; sarva—all; kṣetreṣu—in bodily fields; bhārata—O son of Bharata; kṣetra—field of activities (the body); kṣetrajñayoḥ—the knower of the field; jñānam—knowledge; yat—that which is taught; tat—that; jñānam—knowledge; matam—opinion; mama—that. [01:31] Translation: "O scion of Bhārata, you should also understand that I am also the knower in all bodies, and to understand this body and its owner is called knowledge. That is My opinion." Prabhupāda: So Arjuna inquired from Kṛṣṇa six things: kṣetra, kṣetrajña, prakṛti, puruṣa, jñānam, jñeyam. What is knowledge and what is the object of knowledge, jñānam jñeyam.
And kṣetra, field of activities; kṣetrajña, the worker on that field; kṣetra, kṣetrajña and prakṛti, nature; and the puruṣa. Material nature and puruṣa means the enjoyer. Six question. Of course, Bhagavad-gītā is, each and every word and letter, is full of knowledge.
But these six inquiries, if actually can understand the six items, he becomes the perfect knower. That is said by Kṛṣṇa: yat taj jñānaṁ mataṁ mama. Jñānam means knowledge. So if anyone can understand the six items, then he is in full knowledge. Yat taj jñānaṁ mataṁ mama.
"You have asked Me, Arjuna..." And bhagavān uvāca, and the Supreme Personality of Godhead speaking. Not only speaking; He says, just like a gentleman... Whatever He says is perfect, but still He says, "This is My opinion." "This is My opinion." Now my opinion you can take or not take, that is up to you. But who can give better opinion than Kṛṣṇa?
That is another knowledge. Why Kṛṣṇa? Arjuna is asking Kṛṣṇa. Because in the beginning he has said that "Nobody can make solution of my problem.
You are the best." So following the footsteps of Arjuna, if we accept Kṛṣṇa's words, not blindly but with good logic, good scientific research, if we actually try to understand what Kṛṣṇa speaks, then all our problems are solved. Now in the previous verse, śrī bhagavān uvāca. Vyāsadeva could have said kṛṣṇa uvāca, "Kṛṣṇa said." No. He has purposefully said bhagavān. Kṛṣṇa, you may not like, but He is the Supreme Personality of Godhead, Bhagavān, with six opulences.
One of the opulence is full knowledge. Aiśvaryasya samagrasya vīryasya yaśasaḥ sriyaḥ jñāna [Viṣṇu Purāṇa 6.5.47]. Kṛṣṇa is complete in knowledge. Sarvajña.