श्री भगवानुवाच मया प्रसन्नेन तवार्जुनेदं रूपं परं दर्शितमात्मयोगात्। तेजोमयं विश्वमनन्तमाद्यं यन्मे त्वदन्येन न दृष्टपूर्वम्
śhrī-bhagavān uvācha mayā prasannena tavārjunedaṁ rūpaṁ paraṁ darśhitam ātma-yogāt tejo-mayaṁ viśhvam anantam ādyaṁ yan me tvad anyena na dṛiṣhṭa-pūrvam
Lord Shri Krishna replied: My beloved friend! It is only through My grace and power that you have been able to see this vision of splendour, the Universal, the Infinite, the Original. Never has it been seen by anyone else.
Translated by Shri Purohit Swami
The Blessed Lord said, "O Arjuna, this Cosmic Form has graciously been shown to you by Me through My own Yogic power. It is full of splendour, primeval, and infinite; this Cosmic Form of Mine has never been seen before by anyone other than you."
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
śhrī-bhagavān uvācha—the Blessed Lord said; mayā—by me; prasannena—being pleased; tava—with you; arjuna—Arjun; idam—this; rūpam—form; param—divine; darśhitam—shown; ātma-yogāt—by my Yogmaya power; tejaḥ-mayam—resplendent; viśhwam—cosmic; anantam—unlimited; ādyam—primeval; yat—which; me—my; tvat anyena—other than you; na dṛiṣhṭa-pūrvam—no one has ever seen