When we pursue something, we spend every day working towards it. This is similar to fulfilling something, because we also work on that every single day.
There are, however, many differences between pursuing and fulfilling.
When we pursue something, the steps we take towards it mean nothing to the greater story around us, and the goal is always a self-centered ambition or desire.
However, when we fulfill our calling, we fight for the dream that we envision every day, and we experience that dream every day. When we fulfill our calling, we are blessed with the joy that comes with every moment. We stand where we are meant to be.
When we pursue happiness, however, we only feel that brief emotion when the goal is reached, leaving everything else along the way. We are left in misery for us and everyone around us.