I thought the line came from Blake's "Jerusalem", which is sung (rarely, outside of England) as a hymn in the Anglican church.

Bring me my bow of burning gold
Bring me my arrows of desire
Bring me my spear, O clouds unfold
Bring me my chariot of fire
I will not cease from mental strife
Nor shall my sword sleep in my hand
'Til we have built Jerusalem
In England's green and pleasant land.

If this is the one, there was a thread on it some time ago.