A person is living their purpose if they possess a vision or pursuit that they would not trade for a billion dollars.

“If you have an idea that you want to pursue and you can't be bought off, then you're living your purpose.”

The billion-dollar question is a useful mental framework for distinguishing between doing something for money versus doing it for purpose.

“I don't take it too literally. I don't imagine it like literally a billion dollars. I I I treat this more as like a general feeling of like, am I doing it for the money or am I doing it not for the money?”