During the Warring States Period (475-221 B.C.), the emperor of the Qi State suffered from depression.Wen Zhi was invited to see him.
After feeling the pulse, Wen Zhi believed that the emperor's problem was caused by pensiveness, which did not respond to medicinal herbs. He thought making the emperor angry was the best remedy.
He made an appointment with the emperor, but he did not go to see him on purpose for three times. It made the emperor very angry.