Osip Emilevich Mandelstam - I could not among the misty clouds

I could not among the misty clouds
Your unstable and painful image catch,
'Oh, my God', I promptly said aloud,
Having not a thought these words to fetch.

As a bird -- an immense bird and sound --
Holly Name flew out of my chest.
And ahead the mist mysterious crowds,
And the empty cage behind me rests.

Osip Emilevich Mandelstam

http://www.poemhunter.com/poem/i-could-not-among-the-misty-clouds/