"Climb up and look out to sea," [Elijah] directed his servant, who went up and looked, but reported, "There is nothing." Seven times he said, "Go look again!"
And the seventh time the youth reported, "There is a cloud as small as a man's hand rising from the sea." (1 Kings18: 43-44)
This small cloud, first visible after a very long period of drought, brings life-giving water to refresh the parched land. This cloud is also a symbol of Mary who bore the Word Incarnate and brought Him to the world to restore life to the desert.
Likewise, Mary can keep bringing rain to souls and keep them from turning into a dry wasteland.