I think the parable is a peculiar way of saying that redemption is immanent whether or not it's imminent, that the world to come is in a sense always already here, if still unavailable. I find this idea powerful for several reasons. For one thing, it's an antidote to despair.
Nobody is the author or producer of his own life story. . . somebody began it and is its subject in the twofold sense, namely, its actor and sufferer. . . but nobody is the author.