Because the brain represents the body and the mind represents the soul or spirit. It is the extra dimensionality of human thought process understood by Hebrew vs greek philosophy showing.
Agree mostly. Think the word represents is inaccurate. Think that there are operations by the mind e.g. rational thought and by the brain e.g. storing memory and perceptions. The operations of both influence each other.
Feeling should agree with rational thought so that both are strengthened.
Aristotelian I think.
The brain is the hardware that runs the software, the mind.