Brave New World by Aldous Huxley. It is a full-length novel.
There are two main human sins from which all the others derive: impatience and indolence. It was because of impatience that they were expelled from Paradise, it is because of indolence that they do not return. Yet perhaps there is only one major sin: impatience. Because of impatience they were expelled, because of impatience they do not return.