There was once a man from Song who was skilled at making ointment for chapped hands. For generations, his family had made their living by washing raw silk. A traveler happened to hear of it and offered to purchase the formula for a hundred catties of gold. The man called his family into conference and said, ‘For generations we’ve made our living washing silk and never earned more than a few pieces gold. Now we can sell our formula and earn a hundred catties of gold in an instant. Let’s give it to him!’ Once the traveler had the formula, he went to the court of Wu to persuade the king to use it in dealing with his troublesome neighbor state of Yue. The king put him in command of his forces to engage Yue’s navy in a midwinter river battle and the forces of Yue were routed. The King of Wu carved a slice from his newly gained territory and rewarded the traveler with a fief. The traveler and the silk washer were alike in possessing the formula of preventing chapped hands; one used it to gain a fief, the other to wash silk – it was in the use of the thing that they differed." [1]
[1] https://factsanddetails.com/china/cat3/sub10/entry-5581.html