All I know is that, like Santiago the shepherd boy, we all need to be aware of our personal calling. What is a personal calling? It is God's blessing, it is the path that God chose for you here on Earth. Whenever we do something that fills us with enthusiasm, we are following our legend.
This is the most dangerous of obstacles because it has a kind of saintly aura about it: renouncing joy and conquest. But if you believe yourself worthy of the thing you fought so hard to get, then you become an instrument of God, you help the Soul of the World, and you understand why you are here.