From "Smallville: Salvation (#9.21)"
This is the only peaceful way to eliminate the threat. Without a war, a war that no one will win... once the Kandorians are gone, there will be other threats to mankind. The world will need you. You'll have to work together to become the team that you were meant to be. I once believed that my destiny was here on Earth, but now you need to accept that destiny for me.
We'll protect the world... as one.
It's been my honor to serve alongside each and everyone of you.
The honor was ours, Kal-El.