I just met a pilot, at the airport of all places, who has been flying for 50 years! As I was starting my car to take my son home, I complimented his plane and it opened the door. He walked over and talked my ear off about flying and how excited it makes him to see young people interested in aviation. Usually, when strangers 40 years to my senior start talking, I make an effort to listen and be respectful, but this guy was so passionate about flying that no effort was needed. It was cool to see how excited he still got just talking about his passion.
Passion is something more than dedication or responsibility. Passion is the fuel for those two things. It's a lot easier to choose healthy foods and show up to that workout with all the movements you dread when your passion requires you to be at your best physically. I'm not saying your passion has to be exercise. But your passion may be what motivates you to exercise and stick with that certain way of eating.