Pope Leo quotes GKC

Pope Leo recently quoted GKC:

There is a quote from the author Chesterton that can serve as a key to understanding everything I would like to share with you: "Take away the supernatural, and what remains is the unnatural" (cf. Heretics, VI). Man is not made to live closed in on himself, but in a living relationship with God. When that relationship is obscured or weakened, life begins to fall into disorder from within. The unnatural is not only the scandalous; it is enough to live without God in daily life, leaving him out of the criteria and decisions with which we face existence. [Source]