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First, this faith does indeed become a virtue, in the Christian sense. The initial reaching out in grateful response, itself precipitated by the work of the Spirit and the preaching of the Word, is the start of a lifelong reaching out, a faithfulness that, like the initial faith, is the answer to God's faithfulness in Jesus Christ and in the word of the gospel. But this lifelong faithfulness, sharing as it does the nature and character of the initial faith by which one is justified, is not (again, as in some romantic or existentialist dreamings) a matter of giving expression to how one happens to be feeling at the time. (One of the evils of our age is first to say "I feel" when we mean "I think";
then to pass, subtly, to the point where actual feelings have taken the place of actual thought; then to pass beyond that again, to the point where "feeling" automatically trumps "thinking"; then to reach the point where thought has disappeared altogether, leaving us merely with Eliot's "undisciplined squads of emotion. "35 At that point, one of the nadirs of postmodernity, we have left behind both the classical and the Christian traditions, though tragically you can see exactly this sequence worked out in various would-be Christian contexts, not least Synods.)
This lifelong faithfulness is a matter of practice. It means acquiring a habit: making a thousand small decisions to trust God now, in this matter, to believe in Jesus and his death and resurrection today, to be faithful and trustworthy to him here and now, in this situation ... and so coming, by slow steps and small degrees, to the point where faith, trust, belief, and faithfulness become, as we properly say in relation to virtue, "second nature" Not "first nature;' doing what comes naturally. No: second nature, doing from the heart that which the heart has learned by practice and hard work. Christian faith thus reaches out, by Spirit-inspired and eschatologically framed moral effort, toward the telos for which we were made, that we should be image-bearers of the faithful God. This means, in the terms I have posed in this paper, that faith is indeed one of the things we learn to do in the present time that truly anticipates the full life of the coming age. This is the sense, I think, in which lifelong Christian faith, though not different in kind or content from the faith by which one is justified (but only in temporal location, i.e., ongoing rather than initial), is indeed to be reckoned among the virtues.
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J. Ross Wagner (The Word Leaps the Gap: Essays on Scripture and Theology in Honor of Richard B. Hays)