Educational psychologist Angela Lee Duckworth argues that intelligence and talent are overrated as determinants of long-term success and that the most important predictor of achievement is a trait called grit, which she defines as "perseverance and passion for long-term goals.” Duckworth further notes that the “gritty individual approaches achievement as a marathon; his or her advantage is stamina.” Write an essay that argues your position on the degree to which grit determines one's ability to achieve.