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.