What are two main themes in the poem "Bullocky," and how has author conveyed them through use of various literary devices?

This
poem is obviously rooted in biblicaland ideas. The two references to Moses, the "shouted
prayers and prophecies," the "apocalyptic dream," of the journeyall these attest
to the poem's being, at least in one sense, a reenactment of the story of Exodus and the finding
of the promised land. The biblical exodus is used as a paradigm of later treks throughout
history. Though Wright was Australian, Americans can just as easily identify with the poem's
evocation of the exploration of the US West. But to nail the poem down to specifics in this way
is to miss the point, I think.

If we are to identify two themes, I would
choose, first, the need humanity has for change, for an endless striving forward for new things.
The literary device Wright uses is, as stated, theof a man driving a team of bullocks or oxen
across a vast plain. But beyond that is the theme that it is a trek enacted repeatedly, over
many years:

While past the campfire's crimson
ring

the star struck darkness...