I believe that one of the biggest challenges we can face is the temptation to assume it's enough merely to know something is true. That's easy to do when we're given so much good teaching. We can become impressed with ourselves, satisfied in the fact that, hey — we know.
But as James writes,
But be doers of the word, and not hearers only, deceiving yourselves. For if anyone is a hearer of the word and not a doer, he is like a man who looks intently at his natural face in a mirror. For he looks at himself and goes away and at once forgets what he was like. But the one who looks into the perfect law, the law of liberty, and perseveres, being no hearer who forgets but a doer who acts, he will be blessed in his doing. (1:22-25esv)
we can't just stop with hearing, knowing, acknowledging. Many of us could ace a written test on the centrality of the church. But this is just mental assent and, by itself, mental assent has never accomplished anything. We must also act on what we know. What about that string of real-life tests we're in every week, every day? These are the true proofs of passion for the church. How do you do on those?
It's also dangerous to assume that passion for the church is something we can take care of once and for all. "Oh yeah, passion for the church, I think it was '99 that we did that. We're all set now." But it's not like that; it's not like getting your tonsils out. What happened weeks or months or years ago, as wonderful and necessary as it may have been then, doesn't mean we have passion for the church now. Our zeal for the church is something we must continually evaluate based on the decisions we are making, and how we are living, today.