How a person behaves, feels and thinks, how he conducts himself in a given set of circumstances is largely determined by the state of his mind.
 
Mere external appearance or a person’s speech or mannerisms are only fringes of one’s personality. They do not reflect the real personality.
 
Personality development in the real sense refers to deeper levels of a person. So a study of our personality should start from a clear grasp of the nature of our mind, and how it functions.