Chāndogya Upaniṣad 8.4

8.4.1

atha ya ātmā sa setur dhṛtir eṣāṃ lokānām asaṃbhedāya \
naitaṃ setum ahorātre tarato na jarā na mṛtyur na śoko na sukṛtam \
sarve pāpmāno 'to nivartante \
apahatapāpmā hy eṣa brahmalokaḥ \\804.1\

1. Now, the Soul (Ātman) is the bridge [or, dam], the separation for keeping these worlds apart. Over that bridge [or, dam] there cross neither day, nor night, nor old age, nor death, nor sorrow, nor well-doing, nor evil-doing.

2. All evils turn back therefrom, for that Brahma-world is freed from evil. (2) Therefore, verily, upon crossing that bridge, if one is blind, he becomes no longer blind; if he is sick, he becomes no longer sick. Therefore, verily, upon

8.4.2

tasmād vā etaṃ setuṃ tīrtvā andhaḥ sann anandho bhavati \
viddhaḥ sann aviddho bhavati \
upatāpī sann anupatāpī bhavati \
tasmād vā etaṃ setuṃ tīrtvā api naktam ahar evābhiniṣpadyate \
sakṛd vibhāto hy evaiṣa brahmalokaḥ \\804.2\

crossing that bridge, the night appears even as the day, for that Brahma-world is ever illumined.

8.4.3

tad ya evaitaṃ brahmalokaṃ brahmacaryeṇānuvindanti teṣām evaiṣa brahmalokaḥ \
teṣāṃ sarveṣu lokeṣu kāmacāro bhavati \\804.3\

3. But only they who find that Brahma-world through the chaste life of a student of sacred knowledge (_brahmacarya_)—only they possess that Brahma-world. In all worlds they possess unlimited freedom.