heart is emotional mind
Xin" is the classical character for "mind
Xin in chinese carries a board meaning and numerous interpretation. It has been tried for decades to explain what "Xin" is but still cannot transcribe clearly. "Xin" is NOT the classical character for "mind" in chinese but there is no closer word to translate.
One method trying to get closer to the "Xin" is on a sitting meditation posture, relax, calm down, and listen to your own heart beat, then feel the blood flow in the body, and ...... Tried not to think and stop the thought once it comes in. So, shut off the mind. It is the beginning of not everything but something.