I think she means dating someone who might be called to serve God full time, like a missionary, versus someone who is a Christian, but has a job in the secular world, like drives a taxi cab.
If that's the case, then only date them if you are willing to marry someone who's in the ministry. Being a minister's wife is hard. I watched my mom and other wives having to put up with a lot of things, that most women don't, such as children being put on a special role model pedal. Or expected to slave in the church, simply because they are the pastor's wife, deacon's wife, etc. I've also know that opposite can also occur, where the church steps in and takes care of the pastor's wife, but that's not usually the case. So, if you are willing to live that type of life, then go for it. This is assuming, you are referring to ministry called men as being chosen.
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After reading the op's post again, I realize I may have misread, however, same advice still applies. Are you willing to deal with a lot by being his wife?