This is a commonplace of motivational self-help, e.g. the famous quote from Calvin Coolidge:
Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan 'Press On' has solved and always will solve the problems of the human race.
Obviously, you need something worth persisting with. But the capacity for mental long-distance endurance is an important strength to have to achieve a goal.
(I have very little, fwiw.)
for mental long-distance endurance
I do not this this is what he means by 'determination'
Paul Graham of Y-Combinator on picking winners-at-life:
Paul Graham spills: Why some companies get his cash and others don't