So what is that thing? It is definition by negation. We cannot understand in our present state what is that spirit soul, although we can perceive that there is something—in the absence of that something, this body is nothing but a lump of matter. That we get experience every day. But we cannot see what is that. Therefore atheist class or the persons with poor fund of knowledge, they deny the existence. They cannot see. But they cannot answer that "Why the body is no more working? What is that thing which is absent?" They have tried to explain in so many ways how that something . . . But they could not practically explain. We have to understand it by the śruti process, Vedic knowledge. That is real understanding. And understanding from the right person, Kṛṣṇa or His representative. And it has to be understood simply by hearing. There is no other process. You cannot see; it is so small particle. Keśāgra-śata-bhāgasya śatadhā kalpitasya ca (CC Madhya 19.140). So in these material eyes we cannot see even the spiritual spark within the body. How you can see the Supreme Spirit? That is not possible. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). These blunt senses cannot see. But we can perceive. This much concession is there, and one can become completely free from bodily conception of life. That is . . .
Here is the example by Ṛṣabhadeva. There are many. In the yogic process, aṇimā-siddhi . . . Yogīs, those who have attained some perfection in the yoga process, you can put him into locked room, but they'll come out. That is called aṇimā-siddhi. Very small, the spirit soul, he'll come out. Aṇimā, laghimā, prāpti, siddhi, there are eight kinds of . . . He can do that. There was one sannyāsī, Trailinga Swami in Benares. He was sitting on the road naked. The police objected. So several times he was taken and put into the police custody, but he came out. Again he was sitting. This is yoga-siddhi. Then he was allowed—"Hopeless." They cannot be locked up. That is yoga-siddhi, not merely showing some gymnastic process. No. One must be . . . That yoga-siddhi, it is not possible in this age because people are not expert to practice this yoga system. Therefore Arjuna denied, "No, no, no. Kṛṣṇa, it is not possible for me to practice this yoga system. It is impossible for me." So five thousand years ago he said, "Impossible," but we are daring to make it possible. That is not very good. Better, as Kṛṣṇa says . . . To encourage Arjuna, Kṛṣṇa said that "Don't be discouraged because you cannot practice this yoga system. Here is the best process." What is that? Yoginām api sarveṣāṁ mad-gatenāntar-ātmanā (BG 6.47): "If you simply think of Me, then you are the best yogī."
So everything will be perfectly executed—yoga, jñāna, karma, and many other processes—if you become Kṛṣṇa conscious. That is the real purpose. If you come to the platform of Kṛṣṇa consciousness, then everything is perfect. Even if you cannot execute yoga, jñāna, karma perfectly, still you are perfect. Still you are perfect. But the central point is that we must be absorbed always in thinking of Kṛṣṇa within the core of our heart. Satataṁ kīrtayanto māṁ yatantaś ca dṛḍha-vratāḥ (BG 9.14). Simply you should remain Kṛṣṇa conscious twenty-four hours, even in sleeping. That is the perfect stage. But we have to practice. It is not simply words. But it can be practiced; it is not impossible.