One story is good until another's told.

An account may seem convincing or satisfying when it is the only version heard. Its apparent strength can change once someone else tells a different account.

The saying cautions against treating the first explanation as final. Hearing another version can alter how people judge what seemed like a good story.

Use it when a first account has won approval but a later account may complicate or challenge it. It suits discussion of conflicting explanations or testimony.