Preface to the Diagrams and Explanations of Wondrous Machines

...the state in times of emergency or the daily life of the common people? How has it benefited even a hair's breadth? This book spreads these ideas widely. It is truly a great vessel to benefit the world and provide aid. How can this just be a kindness to Yangzhou? The Yinfu The Classic of the Hidden Talisman says: "When there are wondrous machines, ten thousand phenomena are produced."