The Seventh Day, Without Evening and Setting, the Image of Eternal Life and Rest in God
51 But the seventh day is without any evening, nor has it any setting, because You have sanctified it to an everlasting continuance that that which Thou did after Your works, which were very good, resting on the seventh day, although in unbroken rest You made them that the voice of Your Book may speak beforehand unto us, that we also after our works (therefore very good, because You have given them unto us) may repose in You also in the Sabbath of eternal life.
Source: Confessions (New Advent)