An Enquiry Concerning The Principles Of Morals - pg. 138

It is observable, that the great charm of poetry consists in lively pictures of the sublime passions, magnanimity, courage, disdain of fortune; or those of the tender affections, love and friendship; which warm the heart, and diffuse over it similar sentiments and emotions. And though all kinds of passion, even the most disagreeable, such as grief and anger, are observed, when excited by poetry, to convey a satisfaction, from a mechanism of nature, not easy to be explained: Yet those more elevated or softer affections have a peculiar influence, and please from more than one cause or principle. Not to mention, that they alone interest us in the fortune of the persons represented, or communicate any esteem and affection for their character.