Equilibrium

All systems reach equilibrium. The world is a system. The world is in equilibrium.

Scary thought, right?

This isn't meant to be doom and gloom. If anything, it should reduce stress. What it means is there will always be people doing good, and people doing bad. 

This means that, as a good person, you should still do your level best to improve things - just readjust your expectations so that things staying the exact same feels like a win.

If you're lucky (dedicated?) enough to actually make the world a better place, you've done the impossible.