So you think that new module of code that you just whipped up is just fine? You even wrote it with a pair or two! All of the names are the best that you could think of, the thesaurus is still smoking as it sits next to your keyboard. Control flow effortlessly flows from one expression to the next. Data dances in happiness for the structures that you have decided to use. This is not in any way going to be a maintenance problem!
Are you sure? Have you tested it? No, not that kind of testing. I trust that you have a good set of unit tests. Maybe even some nice acceptance tests that were looked at, or provided, by your stakeholder. No, what I mean is have you tested that it won’t be a maintenance problem?