In my perspective, we should not invest all our time and energy into one goal without doing a kind of assessment regularly. Moreover, sometimes we can realize that the choices we made are not the best for us, or the path we took won't be fruitful and won't bring success. Giving up an activity does not mean failure, it may be a wise and smart decision, person who could predict potential risk early and change the direction of their ship have more chance to win in the end.