(Extracted from Ego is the Enemy by Ryan Holiday)
Passion is seen in those who can tell you in great detail who they intend to become and what their success will be like—they might even be able to tell you specifically when they intend to achieve it or describe to you legitimate and sincere worries they have about the burdens of such accomplishments. They can tell you all the things they’re going to do, or have even begun, but they cannot show you their progress. Because there rarely is any.
Passion is about. (I am so passionate about .) Purpose is to and for. (I must do . I was put here to accomplish . I am willing to endure for the sake of this.) Actually, purpose deemphasizes the I. Purpose is about pursuing something outside yourself as opposed to pleasuring yourself.