All's right with the world - originally from "Pippa Passes" by Robert Browning, this is better known among anime fans from the slogan on the NERV logo in Neon Genesis Evangelion.
As for the other sticker on Ed's briefcase,

Piro speaks:
'tis indeed a 'heart shaped skull' from Serenity Rose. :)
couldn't resist. It's a cute little comic