The lion laying with the lamb is the idea that is either projected back in time, saying that there was a time, or maybe that there will be a time when the horrors of life are no longer necessary for life itself to exist. And the horrors of life are of course that everything eats everything else, and that everything dies, and that everything is born, and that the whole place is a charnal house. It's a catastrophe from beginning to end. This is the vision of it being other than that. There's a strong idea that human beings can interact with reality in such a way so that the tragic and evil elements of it can be mitigated, so that we can move closer to a state of being where we have the benefits of existence without the catastrophe that seems to go along with it.