That ghostly figure, the ideal union of what is best in both personalities, should be constantly regarded as the ruler of the marriage—and, indeed, a… - Jordan Peterson

The lion lying down 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 charnel 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 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.

if one wants to live a full life, one first sets one’s own house in order;

Our eyes are always pointing at things we are interested in approaching, or investigating, or looking for, or having. We must see, but to see, we must aim, so we are always aiming. Our minds are built on the hunting-and-gathering platforms of our bodies. To hunt is to specify a target, track it, and throw at it. To gather is to specify and to grasp. We fling stones, and spears, and boomerangs. We toss balls through hoops, and hit pucks into nets, and curl carved granite rocks down the ice onto horizontal bull’s-eyes. We launch projectiles at targets with bows, guns, rifles and rockets. We hurl insults, launch plans, and pitch ideas. We succeed when we score a goal or hit a target. We fail, or sin, when we do not (as the word sin means to miss the mark70). We cannot navigate, without something to aim at and, while we are in this world, we must always navigate.