When one goes to the beach and stands on the edge of the sea, it is easy to see the vastness of the sea and appreciate the power of the sea. However Rumi is offering us advice from the sea as a point of tolerance, when we contemplate on this example, we see that the sea covers the jagged edges of the world, and smooth out all the rough edges of all the stones that roll in it and tolerate the stones until the edges are smoothed. What do we do? When something or someone bothers us, our natural inclination might be to get rid of that person or thing, in other words, showing intolerance. If we could be tolerant enough with each other and wait out the rough differences between each other until things smooth out like the sea does, we might end up living in a better society.