A mentor of mine is actually Dr. Angela Duckworth, the psychologist at UPenn who has defined this stick-to-itiveness of grit as being "the perseverance and passion for long-term goals."
Una mentora mía, la Dra. Angela Duckworth, psicóloga de UPenn que ha definido esta adherencia a la firmeza como "la perseverancia y la pasión por los objetivos a largo plazo".