"She dwells with Beauty—Beauty that must die;
And Joy, whose hand is ever at his lips
Bidding adieu;..."See in text(Ode on Melancholy)
According to Keats, another condition of melancholy is an appreciation of mortality. Touching on the theme of [“Ode on a Grecian Urn”] (https://www.owleyes.org/text/ode-grecian-urn), the speaker laments the transient nature of beauty and joy. One of Keats’s central themes is that the sweetest things in life must be met with melancholy because they do not last. Keats finally makes his personification of melancholy explicit in the phrase “She dwells with Beauty.”