[of all the lessons he has actually learned, as emperor...]

A single person can never save everyone. And even when we are all united, fate still slips in and steals some from you. There is no perfect campaign. We can only do our best and save enough.

[though he doesn't mention that there's a lot who got themselves killed through their own machinations, unable to be saved by anyone. It would undercut his message and also paint them as dumbasses...though there might be a dumbass or two among the lost]

To be honest, we are spoiled. Being already dead, we have the luxury of repairing lanterns, something the truly living cannot expect. Our second, third, fourth chance is more than most people in the universe will ever see.