Much of the time that you're working on a project, you're performing goal-directed activity. You are actually enjoying the anticipation of accomplishing your goal because it's tantalizingly just out of reach. Once you accomplish your goal, you are in the goal-fulfillment phase. Often, this phase is somehow less satisfying than the goal-directed phase because the challenge is gone.
Goal-directed activity involves the tasks you perform in the expectation of reaching a goal. The Goal- fulfillment involves the attaining of a goal.
In fact, if you think about the life cycle of any endeavor, you'll see that you usually generate much more energy toward the beginning than at the end. That's the power of expectancy. ...