from W.B. Yeats' "Man and the Echo"
O rocky voice Shall we in that great night rejoice? What do we know but that we face One another in this place? But hush, for I have lost the theme, Its joy or night seem but a dream; Up there some hawk or owl has struck Dropping out of sky or rock, A stricken rabbit is crying out And its cry distracts my thought.
-- lines 37-46