Harri Holkeri, a former Finnish prime minister (1937-2011) who helped shepherd talks that led to the historic 1998 peace agreement in Northern Ireland, died this week in Helsinki. In a speech in 2008, Mr. Holkeri cited several reasons he and his colleagues were able to guide the long-divided parties to a deal. I wondered, as I read the NYTimes obituary, whether these might be helpful in navigating our own everyday disagreements and conflicts.