For grapes must be treaded so that the preciousness of wine may flow. So must the virtue of the olive, pressed out by crushing, leave the husk and become the fatness of oil. So likewise is the grain, beaten out on the threshing floor, separated from the chaff, and being cleaned is brought into the barn. Whosoever then is desirous of wholly overcoming his defects, must bear with pleasure the pain of being made clean; and the more he is now purified in the fire of tribulation, the more worthy shall he be to appear at the judgment seat of God.
St. Gregory the Great