Arjuna inquired: O my Lord, O Supreme Person, what is Brahman? What is the self? What are fruitive activities? What is this material manifestation? And what are the demigods? Please explain this to me.
The Supreme Lord said, The indestructible, transcendental living entity is called Brahman, and his eternal nature is called the self. Action pertaining to the development of these material bodies is called karma, or fruitive activities.
Therefore, Arjuna, you should always think of Me in the form of Kṛṣṇa and at the same time carry out your prescribed duty of fighting. With your activities dedicated to Me and your mind and intelligence fixed on Me, you will attain Me without doubt.
One should meditate upon the Supreme Person as the one who knows everything, as He who is the oldest, who is the controller, who is smaller than the smallest, who is the maintainer of everything, who is beyond all material conception, who is inconceivable, and who is always a person. He is luminous like the sun and, being transcendental, is beyond this material nature.
One who, at the time of death, fixes his life air between the eyebrows and in full devotion engages himself in remembering the Supreme Lord, will certainly attain to the Supreme Personality of Godhead.
Persons learned in the Vedas, who utter omkāra and who are great sages in the renounced order, enter into Brahman. Desiring such perfection, one practices celibacy. I shall now explain to you this process by which one may attain salvation.
The yogic situation is that of detachment from all sensual engagements. Closing all the doors of the senses and fixing the mind on the heart and the life air at the top of the head, one establishes himself in yoga.
After being situated in this yoga practice and vibrating the sacred syllable om, the supreme combination of letters, if one thinke of the Supreme Personality of Godhead and quits his body, he will certainly reach the spiritual planets.
From the highest planet in the material world down to the lowest, all are places of misery wherein repeated birth and death take place. But one who attains to My abode, O son of Kuntī, never takes birth again.
Yet there is another nature, which is eternal and is transcendental to this manifested and unmanifested matter. It is supreme and is never annihilated. When all in this world is annihilated, that part remains as it is.
Those who know the Supreme Brahman pass away from the world during the influence of the fiery god, in the light, at an auspicious moment, during the fortnight of the moon and the six months when the sun travels in the north.
The mystic who passes away from this world during the smoke, the night, the moonlight fortnight, or in the six months when the sun passes to the south, or who reaches the moon planet, again comes back.
A person who accepts the path of devotional service is not bereft of the results derived from studying the Vedas, performing austere sacrifices, giving charity or pursuing philosophical and fruitive activities. At the end he reaches the supreme abode.