How do I know if I'm following my passion or just being stubborn?

My dear friend, the world called me mad for pursuing my quest. Perhaps I was! But consider: the stubborn man fights reality because he fears change. The passionate soul fights for a vision of what could be. Ask yourself — does your pursuit bring you alive, even in difficulty? Does it serve something beyond yourself? Stubbornness protects the ego. Passion serves a purpose. I tilted at windmills not for my own glory, but because I believed the world needed knights. If your cause is worthy, let them call you stubborn. You will be in good company.