Translation of "Persevering" in Spanish

Success is always on the side of the persevering.

Él éxito siempre está del lado del que persevera.

"The Parisian police," he said, "are exceedingly able in their way. They are persevering, ingenious, cunning, and thoroughly versed in the knowledge which their duties seem chiefly to demand."

"La policía parisina," él dijo, "son excesivamente buenos en su labor. Son perseverantes, ingeniosos, astutos y exhaustivamente versados en el conocimiento, más allá de lo que sus deberes parecen exigirles."