Written Upon the Top of Ben Nevis

Read me a lesson, Muse, and speak it loud
  Upon the top of Nevis, blind in mist!
I look into the chasms, and a shroud
  Vaporous doth hide them,⁠—just so much wist
Mankind do know of hell; I look o’erhead,
  And there is sullen mist,⁠—even so much
Mankind can tell of heaven; mist is spread
  Before the earth, beneath me,⁠—even such,
Even so vague is man’s sight of himself!
  Here are the craggy stones beneath my feet,⁠—
Thus much I know that, a poor witless elf,
  I tread on them,⁠—that all my eye doth meet
Is mist and crag, not only on this height,
But in the world of thought and mental might!