Again, Scott Hahn has posted reflections on the Sunday readings at the Saint Paul Center's site--you can read them here.
I just want to point out one minor thing about the first reading, in which God promises not to destroy the city of Sodom if "ten" people are found there who are righteous.
That passage always sort of bothered me. Would then God destroy the city if there were nine righteous? Doesn't God care about inflicting wrath on the innocent?
Well, read further in the story. When the three angels arrive at Sodom a mob scene ensues. The citizens demand that Lot turn them over so they can have their way with them. Indeed, one line stands out: "But before they lay down, the men of the city, the men of Sodom, both young and old, all the people to the last man, surrounded the house" (Gen 19:4).
It would seem that the question is a moot point, as the narrative seems to indicate the complete depravity of the city.