And the seven left no offspring. Last of all the woman also died. In the resurrection, when they rise again, whose wife will she be? For the seven had her as wife.” Jesus said to them, “Is this not the reason you are wrong, because you know neither the Scriptures nor the power of God? (Mark 12:22-24)
Why seven? The seven stand for the seven days of creation, the power of nature which can never bring forth divine fruit. Nature has not the power to beget the longed for offspring. In the end, the women dies and dies without child.
But God is the God of the living and not the dead! And Christ is our Eighth day. Christ and his resurrection are the power of eternal life. Of our own, we can bear no fruit worthy of God; we can bring forth no enduring offspring. But the Eighth day marks the day of grace, the day of everlasting life and rest: the fruitfulness of God with his bride.
Same & Other 