Knox was a prose stylist of immense talent whose sharp wit and biting satire poked holes in the smug secularism of his day. In books such as Essays in Satire and Caliban in Grub Street he mocked the dogma-lite Christianity, shallow agnosticism and glib atheism so popular among the elite classes of England. A superb spiritual director, he led many retreats and wrote a number of books about retreats and the spiritual life for both religious and laity. He also wrote murder mysteries (as did G.K. Chesterton and Dorothy Sayers), translated the entire Bible over a nine years period and wrote Enthusiasm, a fascinating and sympathetic history of enthusiast movements (such as Montanism and Quietism) in Christianity.

Like all great preachers and teachers, Knox had a gift for distilling complex matters into understandable and compelling language, and his wry humor makes his lucid writing that much more enjoyable. This was certainly true of his greatest apologetic work, The Belief of Catholics, written in 1927 (and recently republished by Ignatius Press). In it he addressed modernism and the growing skeptism in England about the claims of Christianity; he also took on arguments made against the Catholic Church by various Protestants, many of which are still commonly used by certain Fundamentalists and Evangelicals today. One of these is the faulty claim that a Christian is not dependant, whether historically or practically, upon the Catholic Church for correct doctrine, but that all a believer needs is the Bible. In The Belief of Catholics, in a chapter titled “Where Protestantism Goes Wrong,” Knox demonstrated that how one views the Church will either make or break the basis of their view of Christ, the Bible and authority:

… a proper notion of the Church is a necessary stage before we argue from the authority of Christ to any other theological doctrine whatever. The infallibility of the Church is, for us, the true induction from which all our theological conclusions are derived. The Protestant, stopping short of it, has to rest content with an induction of the false kind; and the vice of that false kind of induction is that all its conclusions are already contained in its premises. Perhaps formal logic is out of date; let me restate the point otherwise. We derive from our apprehension of the living Christ the apprehension of a living Church; it is from that living Church that we take our guidance. Protestantism claims to take its guidance immediately from the living Christ. But what is the guidance he gives us, and where are we to find it?

The claim of many Christians that it is the Bible which fully guides them and provides the final say in matters of their faith is inconsistent and cannot stand in the face of reason:

In fact … the Protestant had no conceivable right to base any arguments on the inspiration of the Bible, for the inspiration of the Bible was a doctrine which had been believed, before the Reformation, on the mere authority of the Church; it rested on exactly the same basis as the doctrine of Transubstantiation. Protestantism repudiated Transubstantiation, and in doing so repudiated the authority of the Church; and then, without a shred of logic, calmly went on believing in the inspiration of the Bible, as if nothing had happened! Did they suppose that Biblical inspiration was a self-evident fact, like the axioms of Euclid?

As Knox indicates, not only does the Bible itself not teach that it is the final and sole authority in the Christian life, this belief ignores the historical facts as to how we received the Bible and by whose authority the canon of Scripture has been set. The Catholic Faith is a seamless garment which demands “all or nothing”; if someone accepts the authority of Scripture, it is logical that they, like Ronald Knox, must also accept the authority of the Catholic Church — it is both necessary and consistent.