Prashna-1-16-teṣāmasau

Sri Shankara’s Commentary (Bhashya) translated by S. Sitarama Sastri

But to whom is that state of lower Brahman marked by the sun, reached by the northern route, untainted, i.e., pure, not tainted like the Brahmalôka of the moon, subject to increase and diminution, is explained. They in whom fraud does not exist, as necessarily it does in householders, resulting in many conflicting modes of conduct; those for whom-falsehood is not unavoidable, as it is in the case of householders on account of play, mirth, etc.; similarly, those in whom there is no dissimulation as in householders. Dissimulation consists in disclosing one’s self in one manner and acting otherwise. It is of the nature of duplicity in behaviour. To those men duly fitted, i.e., the Brahmachârin, the hermit and the sanyâsin in whom, from absence of cause, these faults, such as duplicity, etc., do not exist, is this untainted Brahmalôka, according to the means they employ. Thus, this is the goal of those who combine karma with knowledge (worship). The Brahmalôka previously explained and marked by the moon is for those who perform mere karma.

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॥ इति प्रश्नोपनिषदि प्रथमः प्रश्नः ॥

|| iti praśnopaniṣadi prathamaḥ praśnaḥ ||

Thus ends the First Prasna.

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Links
Various resources on the Prashnopanishad
Upanishad Series – Kena Upanishad Commentary by Swami Chinmayananda