We grow accustomed to the Dark -
When light is put away -
As when the Neighbor holds the Lamp
To witness her Goodbye -

A Moment - We uncertain step
For newness of the night -
Then - fit our Vision to the Dark -
And meet the Road - erect -

And so of larger - Darknesses -
Those Evenings of the Brain -
When not a Moon disclose a sign -
Or Star - come out - within -

The Bravest - grope a little -
And sometimes hit a Tree
Directly in the Forehead -
But as they learn to see -

Either the Darkness alters -
Or something in the sight
Adjusts itself to Midnight -
And Life steps almost straight.

Emily Dickinson

http://www.poemhunter.com/poem/we-grow-accustomed-to-the-dark/