Chandogya Upanishad 8.6

8.6.1

atha yā etā hṛdayasya nāḍyas tāḥ piṅgalasyāṇimnas tiṣṭhanti śuklasya nīlasya pītasya lohitasyeti \
asau vādityaḥ piṅgala eṣa śukla eṣa nīla eṣa pīta eṣa lohitaḥ \\806.1\

1. Now, as for these arteries of the heart—they arise from the finest essence, which is reddish brown, white, blue, yellow, and red: so it is said. Verily, yonder sun is reddish brown; it is white; it is blue; it is yellow; it is red.

8.6.2

tad yathā mahāpatha ātata ubhau grāmau gacchatīmaṃ cāmuṃ caivam evaitā ādityasya raśmaya ubhau lokau gacchantīmaṃ cāmuṃ ca \
amuṣmād ādityāt pratāyante tā āsu nāḍīṣu sṛptāḥ \
ābhyo nāḍībhyaḥ pratāyante te amuṣminn āditye sṛptāḥ \\806.2\

2. Now, as a great extending highway goes to two villages, this one and the yonder, even so these rays of the sun go to two worlds, this one and the yonder. They extend from yonder sun, and creep into these arteries. They extend from these arteries, and creep into yonder sun.

8.6.3

tad yatraitat suptaḥ samastḥ saṃprasannaḥ svapnaṃ na vijānāti \
āsu tadā nāḍīṣu sṛpto bhavati \
taṃ na kaścana pāpmā spṛśati \
tejasā hi tadā saṃpanno bhavati \\806.3\

3. Now, when one is thus sound asleep, composed, serene, he knows no dream; then he has crept into these arteries; so no evil touches him, for then he has reached the Bright Power (_tejas_).

8.6.4

atha yatraitad abalimānaṃ nīto bhavati \
tam abhita āsīnā āhur jānāsi māṃ jānāsi mām iti \
sa yāvad asmāc charīrād anutkrānto bhavati \
tāvaj jānāti \\806.4\

4. Now, when one thus becomes reduced to weakness, those sitting around say: ‘Do you know me?’ ‘Do you know me?’ As long as he has not departed from this body, he knows them.

8.6.5

atha yatraitad asmāc charīrād utkrāmati \
athaitair eva raśmibhir ūrdhvam ākramate \
sa om iti vā hod vā mīyate \
sa yāvat kṣipyen manas tāvad ādityaṃ gacchati \
etad vai khalu lokadvāraṃ viduṣāṃ prapadanaṃ nirodho 'viduṣām \\806.5\

5. But when he thus departs from this body, then he ascends upward with these very rays of the sun. With the thought of _Om_, verily, he passes up. As quickly as one could direct his mind to it, he comes to the sun. That, verily, indeed, is the world-door, an entrance for knowers, a stopping for non-knowers.

8.6.6

tad eṣa ślokaḥ \
śataṃ caikā ca hṛdayasya nāḍyas tāsāṃ mūrdhānam abhiniḥsṛtaikā \
tayordhvam āyann amṛtatvam eti viṣvaṅṅ anyā utkramaṇe bhavanty utkramaṇe bhavanti \\806.6\

6. As to this there is the following verse:—

There are a hundred and one arteries of the heart.
One of these passes up to the crown of the head.
Going up by it, one goes to immortality.
The others are for departing in various directions.