An old man was sweeping the yard in a courtyard under the scorching sun.
Another man passed by and asked him, "How old are you?"
The old man replied, "I'm seventy-seven."
"You are so old! Why are you still working so hard here?"
"Well, because I'm here."
"But why are you working under the scorching sun?"
"Because the sun is there."
Act without worrying about the results, and strive for excellence without dwelling on it.