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Lit., "have We turned it over (sarrafnahu) among them": a reference to the frequent many-faceted reiteration, in the Qur'an as well as in earlier revelations, of all the evidence unmistakably pointing to the existence of a conscious Creator (Zamakhshari).
The water is distributed all over the world, in order that all life may receive its support according to its needs. In xxv. 48-50, we have the argument of contrasts stated in another way. Water is life, and is made available to sustain life all over the world; this is a physical fact which all can see. But water is also the symbol of spiritual life, whose sustaining principle is the Will of Allah as made known to us through Revelation. It sometimes comes to us in our inward or spiritual storms. Many violent unsettlements of the spirit are but heralds of the refreshing showers of spiritual understanding that come in their wake. They purify our souls, and produce spiritual Life even where there was a parched spiritual desert before. They continue to sustain us in our normal spiritual Life out of the reservoirs of Allah's Revelation, which are open to all, and well distributed in time and space. The universality of distribution is again referred to in the following verse.
In contrast to Allah's abounding Mercy is man's base ingratitude.