Everyone uses the expression, but nobody remembers where it came from. It passes between generations with nary a thought to its origin.
Nobody remembers those initial trading ships, returning to port only to find no port left to return to. Where once had been a mighty island city-state was nothing but endless ocean.
Nobody remembers their sorrow upon realizing their home was, somehow, gone from this earth, miles beneath the sea, or remembers their resolve not to let this break them as they set out to build new lives.
Nobody remembers, or everyone does.
After all, everyone uses their expression.