It was as if he was talking to someone he had once been close to but now no longer knew. Primitive animals don't scar. They heal their wounds by mitosis, by regenerating exact duplicates of their missing parts. Humans possess this power, but in a limited capacity. Cells in the liver can regenerate after mild exposure to toxins.
Some nerves regenerate.
Skin regenerates to patch minor scratches and burns. But serious injuries overwhelm this capacity. Wounded humans scar. It is our primary method of repair. As the wound matures, collagen forms the primary ingredient in scar tissue.