Why does Esperanza think Darius is being wise this time?

Darius is considered a very stupid boy by his peers. While he generally acts like a fool and torments the girls, one day the clouds show another side of Darius. He points to a cloud next to a cluster of "popcorn" and calls it "God." Sky is a natural defense, and she feels that her neighborhood does not have as much protection as others: "here there is too much sadness and not enough sky." But as Darius points out, even Mango Street, has what it needs- a spirit of protection above them.