Verily in the creation of the heavens and the earth, and the alternation of night and day, and the ships that course upon the sea laden with that which profiteth mankind, and that which Allah sendeth down of water from the heaven and quickenoth the earth thereby after the death thereof; and scattereth therein of all kinds of moving creatures, and in the veering of the winds and the cloud subjected for service betwixt heaven and earth. are signs unto a people who understand.