单选题
Long long ago, there were two men who had a very fierce quarrel. They argued for a long time, but still they couldn't settle the problem. The incident occurred one morning outside Albert Schweitzer's hospital in the African jungle. A patient who lived in the hospital had gone fishing in another man's boat without permission. He succeeded in getting a tot of fish. Finding out what the patient had done, the owner of the boat thought that he should be given all the fish that were caught. Dr. Schweitzer said to the boat owner: "You are right because the other man ought to have asked permission to use your boat. But you are wrong because you are careless and lazy. Though you have the boat, you don't make good use of it. You merely twisted the chain of your canoe round a palm tree instead of fastening. it with a padlock. Of laziness you are guilty because you were asleep in your hut on this moonlit night instead of making use of the good opportunity for fishing." He turned to the patient: "But you were in the wrong when you took the boat without asking the owner's permission. You were in the right because you were not so lazy as he was and you did not want to let the moonlit night go by without making some use of it." Dr. Schweitzer divided the catch among the fisherman, the boat owner, and the hospital.
单选题
Dr. Schweitzer settled the argument because ______.