In the heart there are five doors guarded by the gods. The door in the east is prāṇa. It is also the eyes, and it is Āditya (Sun). Worship this as the source of brightness and food. He who knows this becomes bright and enjoys food.
Next, the southern door of the heart is vyāna. It is also the ears, and it is the moon. Worship it as the source of prosperity and fame. He who knows this becomes prosperous and famous.
Next, the western door of the heart is apāna. It is also vāk (speech), and it is fire. Worship this (Brahman in the form of apāna) as the radiance of Brahman and as food. He who knows this becomes radiant with the light of Brahman and a great eater of food.
Next, the northern door of the heart is samāna. It is also the mind, and it is the god of rain. Worship this (Brahman in the form of samāna) as fame and beauty. He who knows this becomes famous and beautiful.
Next, the door at the top of the heart is udāna. It is also vāyu (air), and it is ākāśa (space). Worship this (Brahman in the form of udāna) as strength and greatness. He who knows this becomes strong and great.
These five prāṇas are themselves like Brahman, and they are the gatekeepers of Swarg-loka. Anyone who regards these prāṇas as Brahman and as the gatekeepers to Swarg-loka has a heroic child born in his family. Knowing these prāṇas as Brahman and as the gatekeepers of Swarg-loka, a person attains Swarga-loka himself.
Then, higher than this Swarga-loka, above the world, higher than everything, in the highest world, higher than which nothing exists—the light that shines there is the same light that is in a human being.
Here is proof of it: When you touch the body you can feel heat in it. There is also an audible proof of it: When you cover your ears you can hear a sound like a moving chariot, or like the bellowing of a bullock, or like a burning fire. A person should meditate on that light in the body as something that is seen and heard. He who knows this becomes a distinguished person—people want to see him, and he is widely known.