If we look still more closely, we discover that, at root, what produces these two cities is how the members in each of the two societies use their wills. It all depends on whom and how deeply they love and what they are willing to pay as the price of their love. “These two Cities are made by two loves: the early City by love of oneself even to the contempt of God; the heavenly City by love of God even to the contempt of self. The one glories in itself, the other glories in God. The one seeks glory from men; to the other, God, witness of conscience, is its glory. The one lifts up its head in its own glory; the other says to its God, “My glory and the one who raises my head”, (Psalm 3:3), (The City of God, 14, 28.)
I like the analogy above, which says that..."These two cities are made by two loves: the early City by love of oneself even to the contempt of God; the heavenly City by love of God even to the contempt of self. The one glories in itself, the other glories in God."
The flat earth, at least for Catholics here, has more to do with love of God rather than love of self. At least I would hope that this is the case. It seems to be, to me. I've been reading a book by a Novus Ordo Cardinal (a big no-no, I know) but it contains some good insight into our very human preoccupation with ourselves, rather than God. It also speaks to silence and nature. Here are a couple of quotes that are related, I think, to the topic at hand:
"It is necessary to protect precious silence from all parasitical noise of our "ego" which never stops claiming its rights, plunging us into an excessive preoccupation with ourselves. The noise of our memory, which draws us toward the past, that of our recollections or of our sins. The noise of temptation or of acedia, the spirit of gluttony, lust, avarice, sadness, vanity, pride--in short: everything that makes up the spiritual combat that man must wage every day. In order to silence these parasitical noises, in order to consume everything in the sweet flame of the Holy Spirit, silence is the supreme antidote."
"Creation itself is a silent word of God. The wordless beauty of nature displays before our eyes the manifold riches of a Father who is ceaselessly present among men. This divine speech is not audible to ears that are too human. Nevertheless, it is the most profound speech of all. The sun, the moon, and the stars are absolutely silent to our ears, but they are a word and a message essential to our human existence. There is a language of the stars that we can neither know nor comprehend but that God understands perfectly."