Thank you! It seems you become the Chosen One by chance... that also could happen when dealing with obscure Prophecies. ;)
There actually IS a specific combination written in the Prophecy, and a logical process that leads you to discover it by a process of elimination. The combination is reset when you win or close the game.
We are seeing that many players are confused by some aspects of the game, and we are working to fix them as an exercise on iterating playtest-design-implementation. This is thanks to feedback like yours! We hope you will try the new version when we'll manage to release it :D