For some reason, this thought that vocation comes calling, so to speak, is a reassuring one to me. Weigel says that Karol Wojtyla, living in post-WWII Poland, did not choose to become a priest and devote his life to God. He had planned to become an actor/scholar. Rather, he felt strongly that the priesthood chose him, that he had received a call.
This touches on how I try to teach the idea of vocation to my children: that we have no idea what we'll be called to do. Oh, yes -- we have our interests, our ideas and goals, our ambitions and our predictions, but we still really don't know what God has in mind for us.
I didn't set out to become a Catholic, homeschooling mom. I originally majored in theater in college. (Not that I don't do plenty of acting as a mom ....) God has a funny way of sideswiping us, knocking us down with His plans and then helping us up. And, while we regain our balance and refocus our vision, we finally begin to see that His way, really, is oh-so-much better.