Why was the Mystery, hid in God, hidden since the foundation of the world, until revealed to Paul? (Ephesians) It is called a secret(Romans 16:25,26). Why?
Seriously, I'm not sure why the almighty choose to reveal some of the mystery, but not all of it at once. Much still remains a mystery. We have to go by what we've been given. We are promised more will be revealed in the end. Maybe our puny brains just can't handle it all, or maybe it has to be kept a secret from the evil which now rules this world?