Read this excerpt from part 5 of Zeitoun . Progress is being made. It’s so slow sometimes, so terribly so sometimes, but progress is being made. We have removed the rot, we are strengthening the foundations. There is much work to do, and we all know what needs to be done. We can only do the work, he tells Kathy, and his children, and his crew, his friends, anyone he sees. So let us get up early and stay late, and, brick by brick and block by block, let us get that work done. Which word best describes the tone of this excerpt?