I'm not sure why some feel the need to mock people who have beliefs about callings from god, especially when those callings are not doing anyone any harm.
My mom left a nursing career at a hospital where she was the head of the infectious disease department to be a priest because of one of those callings and I'd bet my last dollar she's more sane, kind, smart and all around fan-fucking-tastic than most of the people in this thread. I've certainly never heard her make fun of or question the sanity of anyone who believed something different than her when it came to matters of faith.