“Do you now recognize the harm caused by intemperance? Look in turn at the instances of good behavior due to fasting. The great Moses, after keeping his fast for forty days was able to get the tables of the Law; and when he came down from the mountain and saw the people’s sin, the tablets which he had been successful in obtaining through such intercession he threw down and smashed, thinking it was preposterous that an indulgent and sinful people should receive laws of the Lord’s own making. Accordingly,, that remarkable prophet had again to undergo forty days of fasting so as to be able to receive again tables like the ones he had broken through the people’s sin and bring them down the mountain.
-- St John Chrysostom