If an infinite number of suns were to appear in the sky simultaneously, such effulgence might possibly resemble the splendor of that Supreme Person.
Bhagavad Gita - Chapter 11 - Vishvarupa Darshana Yoga - The Yoga of the Universal Form
At that moment, Arjuna the son of Pandu saw the entire cosmos within the form of the Master of the demigods.
Thus, being overwhelmed with astonishment, Arjuna’s hair stood on end and placing his hands together in prayer, he offered his obeisance to Shri Krishna and spoke.
Arjuna said: O Master, I see within Your body all the demigods and all other forms of life. I see the sages, the celestial serpents, as well as Brahma and Shiva seated on a lotus.
O Master of the universe, I see Your unlimited form with innumerable arms, bellies, mouths and eyes. I see that there is no beginning, middle or end to this universal form of Yours.
I see You in all directions with crown, club and disc-weapon – a mass of radiance illuminating all around You like the brilliance of the sun, making You difficult to behold.
You are the eternal Absolute Truth known by the Vedas. You are the ultimate shelter of the universe. You are the imperishable protector of dharma. I understand You to be the eternal Supreme Person.
I see that You are without beginning, middle or end. You have unlimited power and innumerable arms. Your eyes are the sun and the moon. This entire universe is scorched by the rays emanating from Your mouth like blazing fire.
O Great One, You completely pervade all directions including the space between the higher planets and the earth. Seeing this wonderful and terrifying form of Yours, the three worlds tremble with fear.
The demigods enter into You and fearfully offer prayers to You with folded hands. The assembly of great sages and perfected beings offer choice prayers unto You exclaiming, “May there be auspiciousness!”