A Brush with Greatness

I have often tried to understand: what forms the greatness in a person? The description of greatness may be disputed. However, once in a while, you come across a person, you hear him talk, you observe him and then, without any obvious written reason/description, you feel you are in the company of someone great. No matter how people would describe “greatness”, when you finally meet a “great” person despite the definitions you have learned of greatness, you get a feeling of the greatness in that person.