This task is about translating a given English language sentence to Spanish.
Example: It's this amazing wonderful feeling and you know it when you get it.
Example solution: Es ese sentimiento asombroso e increíble, y lo reconoces cuando lo sientes.
Example explanation: This is a good example because the English sentence has been translated correctly to Spanish.

Problem: "...they told of certain proof---proof beyond the possibility of doubt. But I could form no idea of what sort of proof that was.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Solution: ".. .me hablaron sobre una prueba verdadera --- prueba más allá de la posibilidad de la duda, pero no podía formarme ninguna idea de qué tipo de prueba era.