Read the excerpt from “Albert Schweitzer: A Life of Service and Sacrifice.” In 1953, when Albert had been serving the world for forty-eight of his seventy-eight years, the world decided to serve him. He was granted the Nobel Peace Prize. Albert traveled to Norway to accept the award. Then, still true to the pledge he had made so many years before, he returned to Africa and used the prize money for a hospital addition. He was still there selflessly serving others when he died in 1965.

What is the big-picture idea in this excerpt?