"Of what fashion those days were," says Augustine, "it is either exceeding hard or altogether impossible to think, much more to speak. As for ordinary days, we see they have neither morning nor evening, but as the sun rises and sets. But the first three days of all had no sun, for that was made on the fourth day," etc.--De Civitate Dei, xi. 6, 7. Cf. De Genesis ii. 14.