After showing the need for revelation (57-64), Newbigin shows that the embrace of the gospel is a work of grace. He writes,
Christian discipleship is not a two-stage affair in which a concept of truth is first formulated and is then translated into a program for action. It is a single action of faith and obedience to a living person, the response to a personal calling (66).[1]
The work of God to reveal himself to creatures is a work of grace. He writes,
[The] world is not free as it thinks it is. We are not honest inquirers seeking the truth. We are alienated from truth and are enemies of it. We are by nature idolaters, constructing images of truth shaped by our own desires (69).
If we are to know God and embrace his revelation then he must call us out of the darkness to which we are accustomed and into his marvelous light where Christ is all.
Speaking of the Trinity, Augustine writes “And if this cannot be grasped by the understanding, let it be held by faith, until He shall dawn in the heart who says by the prophet, ‘If ye will not believe, surely ye shall not understand’” (Trinity, 7.12). The reference to Isaiah 9:7 is fundamental to Augustine’s theology. The ESV translates, “If you are not firm in faith, you will not be firm at all.” Although Augustine’s reading does not reflect the grammatical-historical hermeneutic of the present day’s most influential interpretive community, his reading is an accurate judgment in acknowledging the preeminence of faith in the task of knowledge. He discerned that the “Catholic doctrine” required him to believe things that could not be demonstrated (Confessions, 6.5). In Newbigin’s words, the gospel invites us to embrace things for which we cannot have certainty in the present. We are called to believe that which is still open to doubt. But our ability to doubt exists only because we are putting our faith in something else, namely, in the darkness to which we are captive. Augustine writes:
Behold my heart, O Lord, who wouldest I should remember all this, and confess to Thee. Let my soul cleave unto Thee, now that Thou hast freed it from that fast-holding birdlime of death. How wretched was it! And Thou didst irritate the feeling of its wound, that forsaking all else, it might be converted unto Thee, who art above all, and without whom all things would be nothing; be converted, and be healed (Confessions, 6.5).
As Augustine understood, faith is a work of God in calling us to life, breaking us free from the chains that once consumed our “personal commitment.”
[1] Calvin likewise locates the knowledge of God in the realm of trust and reverence. This location of knowledge is in the same vein of our present discussion by providing a theological basis for knowledge. Speaking of knowledge of God demands a different structure than the intellectual edifices of current vogue. See Calvin, Institutes, I.2.