The Meccan Revelations: Page 439 from Volume Four

He said, with the guardianship of light, there will be manifestation, and the eyes of things will appear to him, and his worries and anxieties will be dispersed. He will have excursion, knowledge, and conquest in every one he looks at, which he does not have in the other, so pleasure and joy are associated with it in proportion to the thirst he had to seek what he saw, if it was known to him. This is said by force or in proportion to the rank of that.