Some of the most profound, endearing, and touching words in novels are based around the heart. Below is a quote from an excellent book by Dr. Nuland:
"Some of us have hearts of gold, or of stone,; warm or cold; we open our hearts to certain people, let them look into our hearts to join our hearts to theirs, but non of these seemingly surgical undertakings requires the use of an operating room to make it happen; the same is true for touching the heart, stirring it, breaking it or mending it; we continue to live through we have given our heart to another, or perhaps realize that it belongs to Daddy; the heart may be worn on the sleeve or leap unbidden into the mouth- it is a movable beast. " - by Sherwin B. Nuland, The Mysteries Within.
If you find a quote from a book that includes the heart or even touches your heart dearly, please add it.