(If they want a sign for the perception of this Reality) surety there are countless signs for those who use their common sense; they can see alternation of the night and day, in the ships that sail the ocean laden with cargoes beneficial to mankind, and in the rain-water which Allah sends down from the sky and thereby gives life to the earth after its death and spreads over it all kinds of animate creatures, in the blowing of the winds and in the clouds which obediently wait for orders between the sky and the earth.