In "The Magician's Nephew", Aslan gives a simple warning to the newly born Talking Beasts of Narnia: that they should not go back to the ways of beasts lest they cease to be Talking Beasts.
I was reminded of that in Catherine Deveny's article in The Age where she talks about having shed her faith (sandwiched between layers of exaggerated sarcasm and insults for Catholics and Catholicism). Ms. Deveny at some essay months ago casually mentioned that she was Catholic. Now it's clear: she was Catholic, but she became an atheist years ago. That liberating feeling she describes is indeed a form of freedom, but from what? Sadly, she may not have given that much thought.