I would look at what the Bible means to you in your life. If you see it as an authority, that might mean one thing, if you are struggling with someone else's ideas about the Bible and its importance, that would mean another. Like unto that :-) is how you feel about motherhood; your becoming one and/or your own mother and how the two of you relate. Is someone pressuring you to have a baby? Are you looking for reasons for wanting a baby or not? Are you a mother and looking at your self-esteem issues and how "good" a mother you may be? All those things could make a difference in how you interpret your dream, I don't know you or your life.

How did you feel reading the verse, "stumbling" on it (which implies "by accident"). Some people use the Bible to help them make decisions, open it at random and point to a verse and then attribute meaning to that verse; was that sort of what happened or something else? You read it over and over, was it because you could not believe something so good could be said or did you see it with "horror" because you did not want such a thing to possibly be true?

Did you think of the phrase's "opposite", "Some people are destined to not be mothers"? I was reminded of the phrase, "Some people profit more than others" which is lame because it's a given that some people will be richer and some poorer, there's no new information in that phrase. Your "Some people are destined to be mothers" is sort of the same; of course there will keep being babies born and they will come from their mother. Maybe you are/are not seeing what is obvious in a situation. That you had to read the phrase over and over, it doesn't really say anything, almost makes one laugh thinking about it, in its obviousness.