The travelers and the plane tree

Two travelers, worn down by the heat of the sun, decided to throw themselves on the ground to rest under a large plane tree. While they were resting under its shade, one man said to the other:
-"What useless tree this is! I see that it doesn't bear fruit, and I think we cannot use its wood for anything."
-"Don't be so ungrateful," rustled the tree in reply. "I am being extremely useful, shielding you from the hot sun. And you dare to call me useless and unhelpful!"

Always, we must appreciate and show gratitude for the goods received. Big or small, they're all for our benefit.