Guests, like fish, begin to smell after three days.

Everything has an expiration date

There's a reason this line has stuck around for three centuries: it captures something uncomfortable that most people won't say out loud. We're taught to be gracious hosts and grateful guests, but Franklin was naming the reality underneath those manners. After a certain point, even people we like start to feel like they're taking up space in our homes and our lives.

What makes this observation surprisingly modern is how it applies to so much more than houseguests. It's true of work projects that linger past their deadline, of relationships that have run their course but nobody wants to acknowledge it, of conversations that keep circling the same point. There's a natural half-life to most arrangements—not because people are bad, but because novelty wears off and routines get disrupted. The smell Franklin mentions isn't really about cleanliness; it's about overstaying the invisible expiration date.

The real wisdom here isn't to be cruel about boundaries. It's to notice them before resentment builds. Good hosts know when to warmly suggest checkout time. Good guests read the room and leave while they're still wanted. Most friction in relationships comes from ignoring these natural rhythms rather than respecting them.