"How do I know if she's the one?"
I can't think of a question I encounter more often among single Christian men. The point of the question is clear enough. But a rich irony dwells beneath the question. In a culture that allows us to choose the person we're going to marry, no one wants to make the wrong choice. Especially if, as Christians, we understand that the choice we make is a choice for life.
The question is not merely ironic. If what you're after is a marriage that will glorify God and produce real joy for you and your bride, it's also the wrong question. That's because the unstated goal of the question is "How do I know if she's the one ... for me."
The question frames the entire decision-making process in fundamentally self-oriented — if not downright selfish — terms. And it puts the woman on an extended trial to determine whether or not she meets your needs, fits with your personality, and satisfies your desires. It places you at the center of the process, in the role of a window-shopper, or consumer at a buffet. In this scenario you remain unexamined, unquestioned, and unassailable — sovereign in your tastes and preferences and judgments.