What is the meaning of the poem The Collar written by Herbert?

In The Collar George Herbert writes about how he wants to have free will (he wants to do what he wants) but at the same time he realises that the only free will worth having is the free will to do what God wants.

The same idea is found in Dante's Divine Comedy (the Paradise) when Dante writes:

Nella Sua voluntade e nostra pace

('In His will is our peace').

Many Christians have struggled with the idea that God gives us free will - but only to do what He wants.

This is George Herbert's version of the story.