When marrying, ask yourself this question: Do you believe that you will be able to converse well with this person into your old age? Everything else in marriage is transitory.

Talk your way through fifty years

Most people approach marriage like they're buying a house—checking boxes on features that seem important right now. Does she laugh at my jokes? Do we want kids? Can we afford the down payment? But Nietzsche's question cuts through all that: Can you actually talk to this person when the novelty wears off and you're both fifty, seventy, eighty years old?

It's worth sitting with because physical attraction fades, shared goals shift, even common interests can drift apart. But conversation—the ability to genuinely interest each other, to think together, to be curious about what the other person actually believes—that's what fills the thousands of ordinary hours. It's the difference between being roommates who tolerate each other and being genuinely companionable.

Here's the slightly unsettling part: this question is actually harder to answer before marriage, not easier. You can't fully know someone's mind in the honeymoon phase. So it's less about having perfect certainty and more about recognizing whether real conversation is already happening—whether you're drawn to how this person thinks, not just who they are. That attraction to someone's mind tends to survive when everything else doesn't.