What are the things brain needs to do and why does he do them

The brain is the control center for all the body’s functions, such as walking, talking, swallowing, breathing, taste, smell, heart rate and so on. It also controls all our thinking functions, our emotions, how we behave and all our intellectual  activities, such as how we attend to things, how we perceive and understand our world and its physical surroundings, how we learn and remember.

he agrees with the monk's positions.