A boy wanted to learn about the secret of happiness from a wise man. He had imagined the wise man living a ________ lifestyle like a sage(圣人). But to his surprise, the man lived in a large castle and enjoyed delicious food. After hearing the boy’s thoughts, the wise man ________ the boy to walk around his castle and return in two hours. He also gave him a(n) ________. He handed a spoon with two drops of oil over to the boy. “________ you walk around, carry this spoon without spilling(洒) the oil.” said the wise man. The boy began walking around, keeping his ________ on the spoon. After two hours, he returned. The wise man asked, “What is my castle like? Can you ________ it?” The boy shook his head. “Then ________ and enjoy the beauty of my castle.” The boy did as he was told. This time, he noticed how beautiful the castle was and enjoyed ________. Upon returning, he talked about everything he had seen. “But ________ are the drops of oil?” asked the wise man. Looking down at the spoon he held, The boy found that the oil was gone. The wise man continued, “Remember, a balance(平衡状态) needs to be created between things. When you enjoy the beauty and pleasure of the world ________, carry out your duty(责任) as well. That’s the secret of happiness.”