Final answer:
Paul's letters in the New Testament are typically arranged from longest to shortest, not by chronological, geographical order, or order of importance.
Step-by-step explanation:
The classic way in which Paul wrote his letters was not in a chronological order, nor based on their length, nor strictly organized according to geographical destinations. The letters attributed to Paul in the New Testament are generally ordered based on the length of the letters, from the longest to the shortest. This means that Romans, being the longest, comes first, while shorter letters like Philemon are placed towards the end. However, this does not strictly follow a canonical order of importance, which means there isn't necessarily a ranking of the letters by their theological significance or the issues they address.