Definition.com
The Heart (n.) is a God-shaped vacuum.
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The Heart (n.) is a thing having reasons which reason knows nothing of. We know the truth not only by the reason, but by the heart..
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The Heart (n.) is that through which we know first principles, and reason, which has nothing to do with it, tries in vain to refute them.
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The Heart (n.) is the moral sense, an organ of perception, analogous to hearing or seeing.
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The Heart (n.) perceives God and not the reason.