Yu Qiuyu. "Books are like sunshine; books are like spring rain; books are my soul." This sentence was written by Yu Qiuyu in his book "Cultural Journey". Yu Qiuyu used this sentence to describe the importance of books to people, just like sunshine and spring rain, nourishing the human soul. He believed that books are the crystallization of human wisdom, the ocean of knowledge, and the sustenance of the human soul.