The Heart (n.) is the lair of a ferocious animal... the greatest wrong that you can put upon a man is to provoke him to let out his beast.
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The Heart (n.) is a useful organ that is figuratively said to be the seat of emotions and sentiments - a very pretty fancy which, however, is nothing but a survival of a once universal belief. It is now known that the sentiments and emotions reside in the stomach.
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The Heart (n.) is an automatic muscular bloodpump.
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The Heart (n.) has in it a tiger, a pig, an ass and a nightingale.
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The Heart (n.) has, when hard, a false tongue.