Forget Batman: when I really thought about what I wanted to be when I grew up, I wanted to be my dad.

But the real joy he feels doesn’t come in the guise of Bruce the billionaire playboy. It comes as Batman – when he does what he was meant to do. When he follows his purpose.

Bruce decides to spend the family fortune on capes and crime labs and to fritter away his free time fighting crazy criminals. Now that’s an out-of-the-box calling. What sort of person makes a life change...