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In plain words
'What is your light?' 'For me, by day the sun; at night a lamp and the like.' 'Let it be so. In the seeing of the sun and the lamp, what is the light? Tell me.' 'The eye.' 'When it is closed and so on, what?' 'The intellect.' 'In the seeing of the intellect, what is there?' 'I.' 'Therefore you are the supreme light.' 'That I am, O Master.'
Word for word
What is your light? By day the sun, for me; at night a lamp and so on. Let it be so; in the seeing of sun and lamp, what light? Tell me. The eye. At the time of its closing and so on, what? The intellect. In the seeing of the intellect, what there? I. Therefore you are the supreme light. That I am, O Master.