Image - a family celebrates shabbat
“That the Sabbath and eternity are one – or of the same essence – is an ancient idea. [‘The Seventh day is the sign of the resurrection and the world to come,’ and there shall therefore be no mourning on that day. Vita Adae et Evae, 41.1, The Apocrypha and Pseudopigrapha, ed. Charles, II, 151.]”
Abraham Joshua Heschel, The Sabbath (New York: Farrar, Straus & Giroux, 73 and note 1.