Surah 91. Ash-Shams, Ayah 3

Lit., "it" - a pronoun apparently indicating "the world" or "the earth" (Zamakhshari). It is to be noted that verses {1-10} stress the polarity - both physical and spiritual - inherent in all creation and contrasting with the oneness and uniqueness of the Creator.

The next contrasted pair consists, not of luminaries, but conditions, or periods of time, Day and Night. The Day reveals the sun's glory and the Night conceals it from our sight. So there may be contrasts in our subjective reception of divine light, but it is there, working all the time, and must reappear in its own good time.