The final version of this
The final version of this poem addresses a Lady, while previous versions had addressed Edmund, William, and Sara.  Its first stanza mentions the "New-moon winter-bright," an allusion to the epigraph from the "Ballad of Sir Patrick Spence."  Its line "still I gaze-and with how blank an eye!" is characteristic of its author's concern over his disengagement from his perceptions, a theme prompted by hearing his friend's Ode: Intimations of Immortality.  The seventh stanza opens with the line "Hence, viper thoughts, that coil around my mind" in, FTP, this Coleridge poem describing "a grief without a pang, void, dark, and drear."
The final version of this poem addresses a Lady, while previous versions had addressed Edmund, William, and Sara.  
"Dejection: An Ode"