Sentence:  Hence is that secret pardon we bestow / In the true instinct of the grateful heart, / Upon the Sons of Song. The good they do / In the clear world of their <WSD>Uranian</WSD> art / Endures for ever; while the evil done / In the poor drama of the mortal scene, / Is but a passing cloud before the sun; [...] 
Meaning of the word marked with <WSD> tags:  Celestial, heavenly; uranic.