Such a timeless classic! Having read the whole series, I thought the story culminated when Ryoma helped establish 薩長同盟. And Mr.Shiba summarised it as「事の成す成らぬは、それを言う人間による」”It’s all attributed to who says it as to whether or not it will be accomplished.” - a very simple message that connects all the anecdotes and storylines across the series. I was also reading a book by Carnegie on interpersonal skills to learn more about psychology at a workplace, and his message resonated with me even more.