From Edgar Allan Poe's The Poetic Principle

   We struggle by multiform combinations among the things and thoughts of Time, to attain a portion of that loveliness whose very elements, perhaps, appertain to eternity alone. And thus when by Poetry - or by Music, the most entrancing of the poetic moods, we find ourselves melted into tears - we weep then - not through excess of pleasure, but through a certain, petulant, impatient sorrow at our inability to grasp NOW, wholly, here on earth, at once and forever, those divine and rapturous joys, of which through the poem, or through the music, we attain to but brief and indeterminate glimpses.