The seventh day is called the Sabbath and signifies rest. For in it God rested from all His works Gen. ii. 2., as the divine Scripture says: and so the number of the days goes up to seven and then circles back again and begins at the first. This is the precious number with the Jews, God having ordained that it should be held in honour, and that in no chance fashion but with the imposition of most heavy penalties for the transgression Ex. xiii. 6; Num. xv. 35.. And it was not in a simple fashion that He ordained this, but for certain reasons understood mystically by the spiritual and clear-sighted Greg. Naz., Orat. 44..