I think true happiness is, almost contradictorily, found in the process of achieving it. Humans always strive for more by their nature. Once you achieve your goal, you'll eventually feel stagnant and set something higher. Perhaps the task itself is what we truly enjoy. Whether you think that's bad or not is up to you. On the extremes, some are driven to be more and more charitable, while others strive to be richer. Most people will set smaller goals and just want to get a more comfortable job or have better relationships with the people in their lives.