Some say it is in reaching a predetermined milestone and being able to check it off the list with an enjoyable sense of satisfaction. Others believe in a more nuanced perspective that centers around a feeling that, that goal no longer needs to be achieved in the way it was originally intended. As a result of the journey, there has been a transformation within the individual that makes the accomplishment so much more than a milestone. The milestone to celebrate becomes the transformation, rather than the actual goal.
In other words, who do you have to become to achieve the dream in your heart? How committed are you to the personal development journey that needs to take place in order to become the person that can handle the accomplishment? The questions surrounding the journey to success are just as, if not more important than the actual end goal. The goal can be reached, but the bigger and far more critical question is are you capable of handling the benefits of that milestone?
If you are uncertain of that answer - this is where the real work begins.