Surah 24. An-Nur, Ayah 39

I.e., he is bound to realize on Judgment Day that all his supposedly "good" deeds have been rendered worthless by his deliberate refusal to listen to the voice of truth (Zamakhshari and Razi).

We have had various metaphors to give us an idea of the beneficent Light of Allah. Now we have contrasted metaphors to enable us to see those who deny or refuse that Light, and are overwhelmed in utter darkness. The Light (of Allah) is an absolute Reality, and is mentioned first, and the souls that follow that Light are a reflected reality and are mentioned after the Light. On the other hand the Darkness is not a reality in itself, but a negation of reality; the reflected existences that refuse the Light are mentioned, and then their state, which is Unreality. Two metaphors are given: a mirage, in this verse, and the depths of darkness in the sea, in the next,

The mirage, of which I have seen several instances in the Arabian deserts and in Egypt, is a strange phenomenon of illusion. It is a trick of our vision. In the language of our Parable, it rejects the Light which shows us the Truth, and deceives us with Falsehood. A lonely traveller in a desert, nearly dying of thirst, sees a broad sheet of water. He goes in that direction, lured on and on, but finds nothing at all. He dies in protracted agony.

The rebel against Allah finds himself like the man deluded by a mirage. The Truth which he rejected is always with him. The mirage which he accepted leads to his destruction.