There is an English proverb that says , "The face is the index of the mind". It is absolutely true because our facial expressions are indicate what is going in our mind. If someone is angry his anger which is in his mind immediately reflects on his face also other mental states are reflects on our face.Most of the astrologers guess the forecast of any person with the facial expressions of the people.The Mind and Minds activities are thinking, feeling and Willing and all these activities are clearly seen on the face so with the help of facial expression one can understand the feeling of any person. That is why Jerome Quotes. "The face is the mirror of the mind, and eyes without speaking confess the secrets of the heart."
