Have you ever questioned the value of your heart? Probably not. The heart is known for being the powerhouse of the body, as vital as the brain. The heart muscle plays an integral role in our physical health; we wouldn’t survive without it. However, we value it for more than just its physical function. Our language and its metaphors—heartfelt, heavy-hearted, light-hearted, broken-hearted, having the heart of a lion, and so on—show that our culture associates the heart with psychological, emotional, and even spiritual importance.