Bow down my soul in worship very low
And in the holy silences be lost.
Bow down before the marble Man of Woe,
Bow down before the singing angel host.
What jeweled glory fills my spirit's eye,
What golden grandeur moves the depths of me!
Man of Woe : variation on the phrase Man of Sorrows, used to describe Christ. From the prophecy of the Messiah in  Isaiah 53:3: 
 He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. 
 More specifically the phrase  can refer  to a conventional artistic image of the suffering Christ. In this case it’s a marble sculpture, like this one in Krauszów, Poland: 
 
 Image via Flickr
Saint Isaacs Church Petrograd