The Twelve Books on the Institutes of the Cœnobia, and the Remedies for the Eight Principal Faults

And throughout the whole of the East it has been settled, ever since the time of the preaching of the Apostles, when the Christian faith and religion was founded, that these Vigils should be celebrated as the Sabbath dawns, for this reason,—because, when our Lord and Saviour had been crucified on the sixth day of the week, the disciples, overwhelmed by the freshness of His sufferings, remained watching throughout the whole night, giving no rest or sleep to their eyes. Wherefore, since that time, a service of Vigils has been appointed for this night, and is still observed in the same way up to the present day all through the East. And so, after the exertion of the Vigil, a dispensation from fasting, appointed in like manner for the Sabbath by apostolic men, is not without reason enjoined in all the churches of the East, in accordance with that saying of Ecclesiastes, which, although it has another and a mystical sense, is not misapplied to this, by which we are charged to give to both days—that is, to the seventh and eighth equally—the same share of the service, as it says: “Give a portion to these seven and also to these eight.” For this dispensation from fasting must not be understood as a participation in the Jewish festival by those above all who are shown to be free from all Jewish superstition, but as contributing to that rest of the wearied body of which we have spoken; which, as it fasts continually for five days in the week all through the year, would easily be worn out and fail, unless it were revived by an interval of at least two days.