Aptitude can show calling, but it isn't the only indicator. Ineptitude or dysfunction may reveal calling more than talent, curiously enough.
James HillmanI just read about John Le Carre, the great spy novelist. He had an absolutely miserable childhood. His mother deserted him when he was young. His father was a playboy and a drunk. He was shifted around to many different homes. He knew he was a writer when he was about nine, but he was dyslexic. So here was a person with an absolutely messed-up childhood and a symptom that prevented him from doing what he wanted to do most. Yet that very symptom was part of the calling. It forced him to go deeper.
James HillmanI like to imagine a person's psyche to be like a boardinghouse full of characters. The ones who show up regularly and who habitually follow the house rules may not have met other long-term residents who stay behind closed doors, or who only appear at night. An adequate theory of character must make room for character actors, for the stuntmen and animal handlers, for all the figures who play bit parts and produce unexpected acts. They often make the show fateful, or tragic, or farcically absurd.
James Hillman...you find your genius by looking in the mirror of your life. Your visible image shows your inner truth, so when you're estimating others, what you see is what you get. It therefore becomes critically important to see generously, or you will get only what you see; to see sharply, so that you discern the mix of traits rather than a generalized lump; and to see deeply into dark shadows, or else you will be deceived.
James Hillman