Ill fares the land, to hastening ills a prey,
where wealth accumulates, and men decay:
princes and lords may flourish, or may fade;
a breath can make them, as a breath has made;
but a bold peasantry, their country's pride,
when once destroyed can never be supplied. (lines 51-56)

the greed that destroys the peasantry eventually drives poetry herself to leave england.

what does the above quote from the deserted village, lines 51-56, mean?