And I swear," added Don Quixote, "by the order of knighthood which I have received, and by my vocation of knight-errant, if you gratify me in this, to serve you with all the zeal my calling demands of me, either in relieving your misfortune if it admits of relief, or in joining you in lamenting it as I promised to do."
There are no more uses of "vocation" in the book.
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She not only changed jobs, she changed vocations.
Took a series of interest, aptitude, and personality tests to choose a good vocation.