In this pivotal verse, Sri Krishna shifts the perspective from the temporary struggles of the three Gunas to the absolute reality of the Self. By declaring Himself the 'pratistha' or the substratum of Brahman, Krishna reveals that He is not merely a historical avatar, but the very foundation upon which the impersonal Absolute rests. This dismantles the false duality between the formless Brahman and the personal God; He asserts that the source of immortality, the eternal law of Dharma, and the fountainhead of unadulterated bliss all flow from His own essence. For the seeker, this signifies that the goal of all spiritual inquiry—the realization of the Infinite—is rooted in surrender to the Divine Presence within and without. This statement serves as a profound metaphysical anchor in the Gita. Having traversed the complexities of material conditioning in the fourteenth chapter, the seeker is here invited to transcend the flux of nature by anchoring their consciousness in the Unchanging. Krishna suggests that the bliss (sukha) experienced in the spiritual path is not a worldly emotion but a reflection of His own nature. By identifying Himself as the support of the eternal Dharma, He emphasizes that living in accordance with divine order is the primary way to access the imperishable truth that underlies the illusory play of the material world.

Krishna reveals Himself as the ultimate substrate of all existence, declaring that the Absolute, eternity, and supreme bliss find their foundation and origin in His own being.