In nearly every religion I am aware of, there is a variation of the golden rule. And even for the non-religious, it is a tenet of people who believe in humanistic principles.
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it.
You know I never used to be a bad flyer, but I did start to have a fear of flying after I shot a movie where I was terrorized on a plane. I made Wes Craven's 'Red Eye'. I don't think they're linked but it does make me pause and wonder if they are, so perhaps I will explore that in therapy some day.