न तद्भासयते सूर्यो न शशाङ्को न पावकः ।
यद्गत्वा न निवर्तन्ते तद्धाम परमं मम ॥ १५.६ ॥

na tad-bhāsayate sūryo na śaśāṅko na pāvaka: |
yad-gatvā na nivartante tad-dhāma paramaṃ mama || 15.6 ||

Supreme abode is neither distant nor external

Krishna now clarifies and confirms that to be freed of sukha-duḥkha delusion is to win the supreme spiritual glory, life’s fulfillment. Such a one attains that eternal abode (tad avyayaṃ padam). Is it something like the Vedic Brahmaloka, Creator’s world? The next verse clarifies it significantly:

That, which neither sun nor moon nor fire illumines, is the abode of the Supreme, on reaching where no return or rebirth will ever be.

It is that magnificent abode, which the sun cannot illumine; nor can the moon. Likewise, fire too lights it not. It is that lofty, safest abode, on reaching which, one does not ever return. It is verily immortality, absolute and wholesome!

This is where Krishna excels, the Kurukṣetra dialogue becomes illustrious. The supreme Abode, says Krishna, is not external, objective or sensory. Anything external and objective can be lit up by the sun and similar luminaries. But the senses and external luminaries become powerless to reveal the inner abode. Whatever is outer alone becomes perceptible to the senses. Whatever is within the body, will remain invisible.

What is the summary finding, then? The seeker has to focus his search within himself and unearth the supreme Abode. The means for it is freeing the mind and intelligence from misplaced notions and evaluations like māna, moha and sanga. Therefore, Krishna extols, be given to spiritual knowledge and introspection, and their pursuit, thereby rid desires and their latent causes. Sukha-duḥkhas instead of alluring and repelling, should be made to lead the seeker transcend them resulting in sublimation and enrichment.

The whole pursuit thus becomes personal, inner and based on mind and intelligence. It is equally interactional. None can say that any external factor can intercept it at all. Sharpness and subtlety in understanding it precisely is what really matters.