There are 2 reasons why we do something: for personal gain, or for the gain of others. When you truly follow your passion, both reasons ceased to be seperate. Your work will be both for your gain, as well as the gain of others. However, this Greater Gain will be larger than the sum of both gains.
Likewise, in the course of our work, there is the destination (i.e. goal) and the journey (i.e. means). When you truly follow your passion, your journey and destination will cease to be seperate. You will be nowhere, because they are now-here.