In a living body, there is life and what is this life? When the question begins then you see oh, 'PRANA' - there is life force, and then you go deeper into the study of 'PRANA' and you see there is something more than 'PRANA'. What is that, that is the mind! Oh, then what is the mind? How many types of mind are there? How many functions of the mind are there? This curiosity takes you to the 'Art of Living'. +Sri Sri Ravi Shankar