Just like the sunshine, the sun globe and the sun god. The sunshine is all-pervading, all over the universe, and the sun globe is localized. But within the sun globe there is a person who is called Sūrya-nārāyaṇa, or the sun god. These are facts. Don't think that there is no living entity in the sun planet. There is. Their body is fiery body. That's all. Just like our body in this planet is earthly body, their body is fiery. Out of the five elements, the fire element is very prominent in the sun planet. But there are living entities.
Otherwise, how Kṛṣṇa says, imaṁ vivasvate yogaṁ proktavān aham avyayam (BG 4.1): "First of all, I said this philosophy of Kṛṣṇa consciousness to the sun god"? If there is no living entity, how Kṛṣṇa says there is a sun god? And if we are to believe Kṛṣṇa and the Bhagavad-gītā, we have to accept it that the sun globe is not without living entities. It is also the same, just like we have got hundreds and thousands, millions of living entities here.
So in this way, we have to acquire the knowledge of Kṛṣṇa. That is brahma-jñāna, paramātma-jñāna and bhagavat-tattva-jñāna. And when we realize . . . not only hear theoretically, jñānam . . . that is . . . theoretical knowledge is jñānam. But sa-vijñānam, when we actually perceive, when we actually understand what is the position of Brahman, what is the position of Paramātmā and what is the position of the Personality of Godhead, that is called vijñānam. Jñānaṁ sa-vijñānam. Jñānaṁ te 'haṁ sa-vijñānam idaṁ vakṣyāmy aśeṣataḥ (BG 7.2). Aśeṣataḥ, descriptive, not summarized.
So yaj jñātvā, "If you can understand this knowledge then," yad jñātvā na iha bhūyaḥ anyaj jñātavyam avaśiṣyate, "then you will finish your all knowledge." Yasmin vijñāte sarvam idaṁ vijñātaṁ bhavati (Muṇḍaka Upaniṣad 1.3). The Vedic injunction is that. If you understand Kṛṣṇa, then all knowledge becomes revealed to you. Yasmin vijñāte sarvam idaṁ vijñātaṁ bhavati. That is stated here. Yaj jñātvā neha bhūyaḥ anyaj jñātavyam avaśiṣyate.
Then it is very nice to understand Kṛṣṇa. If by understanding Kṛṣṇa . . . one may say: "Oh, I have understood Kṛṣṇa. Kṛṣṇa was born at Mathurā as the son of Vasudeva and Devakī, and then He went to Vṛndāvana. And He became a friend of the cowherd girls or the boys, and He was playing there. So I have understood Kṛṣṇa." Anyone can say like that. But Kṛṣṇa says that, "I am not so easily understood." Kṛṣṇa says that it is not so easy.