Zhèng shì zhè fèn zhízhuó ràng tā zuìzhōng chénggōng le.
It was precisely this tenacity that led to her eventual success.
Tips
usage
执着 can be positive (persistent, dedicated) or slightly negative (stubborn, unable to let go). Context determines the nuance. Originally a Buddhist term meaning attachment to worldly things.
history
From Buddhist Chinese (执著), meaning clinging attachment to illusions. The modern meaning has shifted to emphasize determination and persistence.