My second thought is from the second reading. While the entire reading speaks against the hording of worldly treasures, one line really stood out to me: "Behold, the wages you withheld from the workers who harvested your fields are crying aloud." To me, this doesn't just mean not paying someone, but not paying them a living wage. Many christian (lower case "c") business-people and corporations have made their profits at the expense of their own workers. Again, the pope has spoken out against this as well.
This was my first mass as cantor, and I'm happy to say that it went well. I love singing for both my own enjoyment and the pleasure that it seems to bring to other people. I need to find the tuner for my guitar and get some practice in with it as well.