"Why William, on that old grey stone
Thus for the length of half a day
Why William, sit you thus alone
And dream your time away?
"Where are your books? that light bequeath'd
To beings else forlorn and blind!
Up! Up! and drink the spirit breath'd
We might envision William in pose of Rodin’s “The Thinker”: 
 
 This opening is the “expostulation” (remonstrance, kindly protest) that sets the poem in motion. The poem will be Wordsworth’s “reply” to the objection that he is too solitary and absorbed in thought.
Expostulation and Reply