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Regarding the double meaning ("manifest" and "manifesting") inherent in the adjective mubin, see note [2] on 12:1 ; for my rendering of God's attribute al-haqq as "the Ultimate Truth", see note [99] on 20:114 . In this particular instance, the active form of mubin ("manifesting") apparently relates to God's revelation, on Judgement Day, of the true nature of man's actions and, thus, of the enormity of the sin to which this passage refers.
All that we thought of hiding will be clear as day before Allah's Judgment Seat, because He is the very essence of Truth and Reality-He is the true Light (xxiv. 35), of which all physical light is merely a type or reflection.