How we cite our quotes:
"Have you ever heard my heart humming away, Grandmamma?" I asked her.
"Often," she said. "I hear it when you are lying very close to me on the pillow at night." (21.48-49)
Have you ever been close enough to someone to hear their heart beat? If so, it was probably someone in your family, right? There are certain things that are shared with just the lucky few in life, and listening to a heartbeat is one of them. (Unless you're a doctor, of course.)