"Desire , to know why, and how, CURIOSITY; such as is in no living creature but Man ; so that Man is distinguished, not only by his Reason; but also by this singular Passion from other Animals ; in whom the appetite of food, and other pleasures of Sense, by predominance, take away the care of knowing causes; which is a Lust of the mind, that by a perseverance of delight in the continual and indefatigable generation of Knowledge, exceedeth the short vehemence of any carnal Pleasure."

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But the most common species of love is that which first arises from beauty, and afterwards diffuses itself into kindness and into the bodily appetite. Kindness or esteem, and the appetite to generation, are too remote to unite easily together. The one is, perhaps, the most refined passion of the soul; the other the most gross and vulgar. The love of beauty is placed in a just medium betwixt them, and partakes of both their natures: From whence it proceeds, that it is so singularly fitted to produce both.

— David Hume