“poetry and music, and not prose and speech, are the natural expressions of the deepest and highest emotions.”
Dana treats music and poetry as forms especially suited to feelings that ordinary explanatory speech cannot fully carry.
Source details
To Cuba and Back, Chapter XVI, “Havana: Worship, Etiquette and Humanitarianism,” Project Gutenberg #33455. Dana reflects that poetry and music are natural expressions of the deepest emotions while observing Catholic worship in Havana. It is nineteenth-century first-person travel, aesthetic and religious observation rather than an empirical law about emotion or communication.