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In plain words
"What is your light?" — "The sun, in the daytime; at night, a lamp or something like it." — "Granted. But in the act of seeing the sun and the lamp, what is the light there? Tell me." — "The eye." — "And when the eye is shut, and in the rest of that kind, what then?" — "The intellect." — "And in the seeing of the intellect?" — "There, I." — "Then you are the supreme light." — "That I am, my Lord."
Close to the Sanskrit
"What is your light?" "The sun, by day; for me at night, a lamp and the like." "Let it be so. In the process of seeing sun and lamp, what is the light? Tell me." "The eye." "At the time of its closing and so forth, what?" "The intellect." "In the seeing of the intellect, what?" "There, I." "Therefore you are the supreme light." "That I am, O Lord."