So it seems you are suffering from a sore heart. It is set to explode after you pull out the pin and let it drop. And you figure I can help you with that? Sadly, this is not the reason I am here. All I am here to do is to tell you the facts as told by religion, science, and conjecture. It is up to you what to do with the information.

According to Wikipedia, The heart is a myogenic muscular organ found in all animals with a circulatory system (including all vertebrates), that is responsible for pumping blood throughout the blood vessels by repeated, rhythmic contractions. The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart".
The vertebrate heart is composed of cardiac muscle, which is an involuntary striated muscle tissue found only in this organ, and connective tissue. The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during an average 66 year lifespan, and weighs approximately 250 to 300 grams (9 to 11 oz) in females and 300 to 350 grams (11 to 12 oz) in males.
So essentially, your heart is what gets your blood pumping, literally. Call it the core fire of your being, if you wish. Looking at it from this empirical view, there's not much to be said about this "sore" part of your being. Too bad, so sad.

Symbolically, the heart has long been used as a symbol to refer to the spiritual, emotional, moral, and in the past also intellectual core of a human being. As the heart was once widely believed to be the seat of the human mind, the word heart continues to be used poetically to refer to the soul, and stylized depictions of hearts are used as prevalent symbols representing love.
Early philosophers like Aristotle thought that the heart was the source of thought, reason, and emotion, and completely rejected the value of the brain. Stoics, on the other hand, thought it was where the soul was located, while in Egyptian mythololgy it was what was weighed in reference to the feather of Ma'at, symbolizing truth, in judging one's soul after death.