And when the clouds gather after the rising of the vapors and thicken, then carry the water, and this - while being known - has already been mentioned in Adh-Dhariyat, Ar-Rum, and others. Then after the carrying, the clouds are compressed until some of them bear down on others, so there are openings from which it emerges. This is summarized and reminded of, so he said with the clear conjunction: "So the differentiators, differentiating." That is, for the clouds until the rain comes forth from within them, and for the wings, and between truth and falsehood, and between grain and seed - and other things.