Once a man broke a car. He invited the master. Master carefully examined the car and said to the owner: “Take a sledgehammer and knock here,” and pointed to where. The owner struck the sledgehammer at the specified place and the machine worked.
After a while, the car broke down again. The man thought: “Why should I pay the master, because he did not do anything, but just pointed with his finger where to beat me.” The man took a sledgehammer and struck the same place. The car did not work. Then the man struck in another place. Beat long and hard in different places, but the car did not work. Then he went to the master and invited him again, but he had to pay ten times more for work.
This is for those who underestimate intellectual work and overestimate physical labor.