17 See what was done, and a public famine avenged, as they say, the sad impiety that what was before profitable only for the comfort of the priests began to be profitable to the use of all. For this reason then, as they say, was the bark shipped from the copses, and fainting men's mouths supped up the unsavoury sap. For this reason changing grain for the Chaonian acorn, going back once more to the food of cattle and the nourishment of wretched provisions, they shook the oaks and solaced their dire hunger in the woods. These, forsooth, were new prodigies on earth, which had never happened before, while heathen superstition was fervent throughout the world! When in truth before did the crop mock the prayers of the grasping husbandman with empty straw, and the blade of grain sought in the furrows fail the hope of the rustic crew?
Source: Letters (New Advent)