How many times do we ponder about the details. Why do make tawaf seven times? Why is it recommended that we repeat each action during ablution three times? Why does Asr prayer have four rakaat? Why are certain zikr to be repeated 33 times, while others, ten times, 34 times or 100 times?
It originates with a small spring, or a series of small streams, a few bodies of trickling water. Then Allah makes them all coalesce, come together and join forces, growing stronger and moving faster until the flow of water meets some resistant rocks and obstacles.