So Arjuna question is prakṛtiṁ puruṣa, "What are these puruṣa? What are the prakṛti?" Kṣetra-kṣetra-jña. "What is this body, kṣetra? And who is the owner of the body?" That we must know. That is the beginning of Bhagavad-gītā. The beginning of spiritual knowledge is to know what is this body and who is the owner of the body. That is the beginning of spiritual knowledge. When Kṛṣṇa began speaking Bhagavad-gītā and Arjuna accepted to become His disciple, śiṣyas te 'haṁ śādhi māṁ prapannam . . . (BG 2.7), when he said . . . so Arjuna was bewildered whether he would fight in the battle or not. So the question was not solved by friendly discussion. Therefore Arjuna surrendered to Kṛṣṇa as a śiṣya, as disciple, not as friend.
So as spiritual master, as teacher, immediately Kṛṣṇa chastised Arjuna, aśocyān anvaśocas tvaṁ prajñā-vādāṁś ca bhāṣase (BG 2.11): "You are talking like a very learned man, but you are lamenting on a subject matter on which no paṇḍita, learned man, laments." Gatāsūn agatāsūṁś ca nānuśocanti paṇḍitāḥ. He very mildly chastised. Indirectly He said that, "You are not paṇḍita; you are a fool, because you are lamenting on this body." Nānuśocanti paṇḍitāḥ. "Those who are paṇḍita, those who are learned, they do not consider this body as very important." They are paṇḍita. But at the present moment everyone is thinking this body as the most important thing.
So according to Bhagavad-gītā . . . not Bhagavad . . . on the Vedic understanding. Anyone who is stressing too much on the body, they are go-khara, asses and cows and animals, what to speak of becoming paṇḍita. But at the present moment, the whole educational system is concentrated on this body, how to keep this body comfortable. Spiritual knowledge does not mean that you neglect your body. No. That is not the idea. But the most important subject matter of understanding is the soul. Ahaṁ brahmāsmi. Brahma-jñāna. Athāto brahma jijñāsā. So far the body is concerned, that has been taken care in so many lives—in animal life, in birds' life, beasts' life, aquatic life. Now athāto brahma jijñāsā. This is the Vedānta instruction, "Now we should take care of the soul, of the Brahman." Ahaṁ brahmāsmi. This is required. That is spiritual knowledge.
Unfortunately, for want of spiritual knowledge, for want of studying Bhagavad-gītā properly, we are simply taking care of this, I mean to say, temporary body. That is being explained. First of all Kṛṣṇa said that this body is the kṣetra. Kṣetra means field of activities. We are acting according to the body we have received. And this owner of the body is working, just like a cultivator has got a certain amount of land and he is cultivating and producing foodstuff according to his own capacity. This is called karma-kāṇḍa. We are working with this body and reaping the result and enjoying it. In this way we are repeating again and again, again and again, transmigration of the soul from one body to another. Tat kṣetraṁ yac ca yādṛk yad vikāri.