Kinda cringe for an origin of a creed, but it's a good rallying phrase. Surprisingly succinct.
"To say that nothing is true, is to realize that the foundations of society are fragile, and that we must be the shepherds of our own civilization. To say that everything is permitted, is to understand that we are the architects of our actions, and that we must live with their consequences, whether glorious or tragic."
Are there any similar phrases you've seen popularized by a game?
The assassins were kinda made to always be incapable of holding power. Their entire role was preventing the templar's from using the alien artifacts to control humanity's development.
What I got was that they just kinda fizzle out during times when the templar's don't have control of the pieces of Eden.