The bestowment of God's distinguishing grace upon a person or nation, by which that person or nation is put in the way of salvation; as, the vocation of the Jews under the old dispensation, and of the Gentiles under the gospel
If you have a vocation, you have a strong feeling that you are especially suited to do a particular job or to fulfil a particular role in life, especially one which involves helping other people. It could well be that he has a real vocation Diana was a young mission school teacher convinced of her vocation to provide support for her schoolgirl pupils