what you can be paid for ∩ what you are good at = your profession
what you love ∩ what you are good at = your passion
what you love ∩ what the world needs = your mission
what the world needs ∩ what you can be paid for = your vocation
what you love ∩ what you are good at ∩ what the world needs ∩ what you can be paid for = your ikigai (reason for being)