Pradyumna: "Then he amalgamated all the sense organs into the mind, then the mind into life, life into breathing, his total existence into the embodiment of the five elements, and his body into death. Then, as pure self, he became free from the material conception of life." (SB 1.15.41)
Prabhupāda: Read the purport also.
Pradyumna: "Mahārāja Yudhiṣṭhira, like his brother Arjuna, began to concentrate and gradually became freed from all material bondage. First of all he concentrated all the actions of the senses amalgamated in the mind. Or in other words, he turned his mind towards transcendental service of the Lord. He prayed that since all material activities were performed by the mind in terms of actions and reactions of the material senses, and since he was going back to Godhead, the mind would wind up its material activities and return towards the transcendental service of the Lord. There was no longer need for material activities. Actually, the activities of the mind cannot be stopped because they are the reflection of the eternal soul. But the quality of the activities can be changed from matter to the transcendental service of the Lord. The material color of the mind is changed by washing it from contaminations of life breathing and therefore getting it freed from the contamination of repeated birth and death and getting it situated in pure spiritual life. All was manifested by the temporary embodiment of the material body, which is a production of mind at the time of death. And if the mind is purified by practice of transcendental loving service of the Lord and the same is constantly engaged in the service of the lotus feet of the Lord, there is no more chance of the mind's producing another material body after death. It will be freed from the absorption of material contamination. The pure soul will be able to return back home, back to Godhead."
Prabhupāda: So this verse describes in the manner of yogic practice. The yogic practice means controlling five kinds of air within the body: prāṇa, apāna, vyāna, like that. That is breathing exercise, yoga practice.
So it appears that Mahārāja Yudhiṣṭhira knew how to practice the yoga. Not only Mahārāja Yudhiṣṭhira, practically any high-class man, especially the brāhmaṇas and the kṣatriyas, every one of them knew this practice, yoga practice. So at the time of death they could utilize, how to give up this body. That is perfection of yoga. The yogis, they can give up the life or give this, relinquish this body, according to his own desire, not compelled by the material condition. That is yoga system. Generally, a man dies under the obligation of material laws. But a yogi, he controls in such a way that he leaves the body...
Just like Bhīṣmadeva. Bhīṣmadeva especially, his father gave him the benediction that so long he would not himself like to die, he'll never die, Bhīṣmadeva. He got this benediction from his father because his promise was very stern, severe. You know the story, that Bhīṣmadeva's father was captivated by the young girl, Satyavatī, and he wanted to marry her. A kṣatriya could do that. But Satyavatī's father disagreed. Although he was king, he could marry anyone he likes. But his (her) father... Still, with the permission of the parents. So the father denied, "No, no, I cannot give you my daughter to you." "Why?" "Because you have got grown-up son, and he will be the king. Why my daughter shall be married with you just like a maid-servant? No." So Bhīṣmadeva could understand that "My father desires to marry this young girl, Satyavatī, and there is some hindrances." So he approached, that "Why don't you give my father your daughter?" So he said, "Because you are his eldest son. You will become king." So he immediately promised that "No, your daughter's son will become king. I will not become king. Give my father, sir." So he said, "No, no, still it is not possible." "Why?" "Because you may not become king. Then your son will become king. I don't want that." So in this way Bhīṣmadeva said, "No, then I shall not marry. Is that all right? Still..." Then he gave his daughter, "Yes." Satyavatī.
So his father, Śantanu Mahārāja, saw that Bhīṣma is so affectionate to his father that for the father's sense gratification he has sacrificed his own. So he gave him this benediction, "My dear son, you are so stern in keeping your promise. So I give you this benediction, that you will never die unless you desire." Therefore Bhīṣmadeva was lying on the bed of arrows, and he left this material world when he desired. So the yogis can do that. The yogis they control the soul. The soul is floating in different airs. So they can control. That is called ṣaṭ-cakraḥ. From the rectum to the abdomen, abdomen to the heart, heart to the collarbone, then collarbone to the palate, and then here. So one who can bring the soul here, they can get out from this hole, it is called brahma-randhra.
So they can go, the yogis, as they desire. Either he can go directly to the spiritual world, or if he likes, he can transfer himself to the higher planetary system. This is yoga practice. Anywhere he likes, he can go. It appears that Yudhiṣṭhira Mahārāja knew perfectly well. Similarly, we see from many other kings' life. Or this yoga practice was done by any gentleman. Therefore they were so sober, steady and determined. Everyone was a yogi. Therefore in the Bhagavad-gītā it is described, rājarṣi. Imaṁ rājarṣayo viduḥ. Ṛṣi. Ṛṣi, saintly persons, they know how to practice yoga. So formerly the kings were as good as ṛṣis. They were simply sitting on the throne as a matter of responsibility to the citizens. They were not political opportunists. No. Nowadays people are political opportunists. As soon as they get some opportunity, they capture the power. Formerly... Just like Bhīṣmadeva. Actually, he would have been the king. But he was not opportunist. To serve his father he gave up everything. This is called rājarṣi.