Last fall he accomplished something that astonished me, and probably not a few of his buddies.
After 22 years of smoking, he quit.
It's remarkable not because he quit, it's remarkable because of the years of trying some tool to quit, not experiencing success, he would again pick himself up, and try again.
Among the things he tried are patches, gum, other pharmaceutical products, hypnosis. It was the hypnosis that allowed him to see and really believe that he could quit. But in the end, he just stopped smoking.
You can call it persistence. You can call it commitment.
Either way, it's the secret ingredient to achievement.