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Thou art the Imperishable, the Supreme Being, worthy to be known. Thou art the great treasure-house of this universe; Thou art the imperishable protector of the eternal Dhrama; Thou art the Primal Person, I deem.

You are the imperishable, the supreme to be known; you are the final resting place of this universe. You are the undying guardian of eternal dharma; you are, I believe, the primeval person.

Arjuna pauses from describing to declare what the form means. Krishna is the akṣara, the imperishable, the highest object of knowledge; the ultimate support or treasury of the universe; the undying protector of eternal dharma; the primordial person (puruṣa). The phrase guardian of eternal dharma links the vision to the battlefield: Arjuna's struggle concerns dharma, and here he recognises its ultimate protector. The words I believe show that this is Arjuna's own conviction, arrived at through what he sees. Vision is turning into understanding.