The heart is just a blood-pump. Nothing more. It has absolutely no neurological connection to, nor control over, the human being.
There you are: the heart's actual function.
For unless you can prove via an EEG connected to your chest and not your head; that it's that organ of yours which controls your conscious self & is the repository of your memories, personality etc & thus your sentience - as per the ancient Egyptians' beliefs - and that the grey matter in your head is just useless crap, then perform a .38/.44/.50 cal. lobotomy on yourself. Now.
...every second you're not, you admit that the heart is a blood-pump, and only that, and we Atheists are right. Aren't you lot always banging on & on about how you are 'In this world, but not of it'...?!
The Samurai of ancient Japan considered the stomach to be the centre of feeling & emotions. Thus the belly-slitting in the act of Seppuku.
How do you know that they're not right? So get that bread knife out of the kitchen drawer and prove them wrong; unless the stomach is used to feel and to sense, to have compassion and care to exhibit kindness what good is it to you?
...except to Dr. Fell, a.k.a. Hannibal Lecter?! [/3rd series of "Hannibal"] >:D
Moral: 'Metaphor'? Bollocks. Here's a couple of meatballs for ya, Dr. Lecter! drpkresearch here says what good are they to him?! Should go well with that nice Chianti. (*Thpt-thpt-thpt-thpt-thpt-thpt!*) X3
Tl;dr: Dr. Christiaan Barnard. Louis Washansky.
NEXT!