Some people just don’t have the cognitive ability, intellectual talent, or mental agility to do these things.
Or plain stick to it Ness.
Many a bright person cannot bother to carry the ball over the goal line.
Yes, perseverance is also important; those who give up too quickly will fail. OTOH, Those who (metaphorically) ride a burning airplane all the way to the ground will also fail. Some times, you have to punch out before it’s too late and either try again or re-consider your life choices.