An empire's trust to keep = the entire empire (all the people)...

An empire's trust to keep = the entire empire (all the people) will give their trust to the Duke of Zhou?

Context:

The mountiantop no height eschews;
The sea eschews no deep.
And the Duke of Zhou spat out his meal
An empire's trust to keep
More:
http://books.google.com.hk/books?id=RtwAMoUzDJcC&pg=PA367&lpg=PA367&dq=%22Sanguine-souled+we+have+to+be:%22&source=bl&ots=p5Da5PDLPO&sig=73Ndixe_VPuZ0S0Ne1sX4y2ZNZg&hl=zh-CN&ei=Bv_FTZqTLJGovQP2kLyxAQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CB4Q6AEwATgK#v=onepage&q=%22Sanguine-souled%20we%20have%20to%20be%3A%22&f=false