Analysis of Sonnet LXXXI: Memorial Thresholds

What place so strange,—though unrevealèd snow
With unimaginable fires arise
At the earth's end,—what passion of surprise
Like frost-bound fire-girt scenes of long ago?
Lo! this is none but I this hour; and lo!
This is the very place which to mine eyes
Those mortal hours in vain immortalize,
'Mid hurrying crowds, with what alone I know.
City, of thine a single simple door,
By some new Power reduplicate, must be
Even yet my life-porch in eternity,
Even with one presence filled, as once of yore:
Or mocking winds whirl round a chaff-strown floor
Thee and thy years and these my words and me.