आकारैः इङ्गितैः गत्या चेष्टया भाषणेन च ।
नेत्र वक्त्र विकारैश्च लक्ष्यतेऽन्तर्गतं मनः ॥

Meaning:
The inherent nature of a person is revealed by his appearance, gestures, behaviour, actions, the way he talks, by the contractions of the face and by the movements of the eyes.