The ancients believed: "The face is the master of one body, and the eyes are the master of one face. To recognize a person, you must first look at the face, and everyone knows it. When you look at a face, you must first look at the eyes. People also know everything, but they may not know all the secrets. ... The method of recognizing people must first be based on the face. The heart, then look at its body. What is the shape of the body? The eyebrows, the mouth, the ears, the nose, the hands and the feet. How can you see the heart if you have eyes?