Important Things in the World Have Been Accomplished by People Who Have Kept On Trying When There Seemed To Be No Hope At All

Dale Carnegie? Lee de Forest? Dorothy Carnegie? Apocryphal? Dear Quote Investigator: Dale Carnegie was a popular author of self-improvement books. He once argued against premature discouragement by asserting that most remarkable achievements had been attained by people who continued to try even when no hope seemed possible. Would you please help me to find a …