The heart of the matter is the heart!
I think it prudent to define what the heart is here. Most think when they hear the word heart that it is the organ in the midst of the chest central to keeping life moving. The human organ or heart is responsible to pump blood all throughout the body providing nourishment to the entirety of the body.
This word heart can mean entire mental and moral activity of a person. We could also say the heart is the hidden man, the real man… The heart according to the study Bible says that that heart is our, desires, affections, perceptions, thoughts, understanding, reasoning, imagination, conscience, intentions purpose, will and faith!.