The Epistles are called "Catholic" because they are not addressed to any particular Church, whether of Thessalonica, or Corinth, or Rome, or Galatia, but to the Church universal, or at any rate to a wide circle of readers. This is the earliest Christian use of the term "catholic," which was applied to the Church itself before it was applied to these or any other writings. "Wheresoever the bishop shall appear, there let the people be," says Ignatius to the Church of Smyrna (viii.), "just as where Jesus Christ is, _there is the Catholic Church_"--the earliest passage in Christian literature in which the phrase "Catholic Church" occurs. And there can be no doubt as to the meaning of the epithet in this expression. In later times, when Christians were oppressed by a consciousness of the slow progress of the Gospel, and by the knowledge that as yet only a fraction of the human race had accepted it, it became customary to explain "catholic" as meaning that which embraces and teaches the whole truth, rather than as that which spreads everywhere and covers the whole earth. But in the first two or three centuries the feeling was rather one of jubilation and triumph at the rapidity with which the "good news" was spreading, and of confidence that "there is not one single race of men, whether barbarians or Greeks, or whatever they may be called, nomads or vagrants, or herdsmen living in tents, among whom prayers and giving of thanks are not offered, through the name of the crucified Jesus, to the Father and Creator of all things" (Justin Martyr, _Trypho_, cxviii.); and that as "the soul is diffused through all the members of the body, Christians are scattered through all the cities of the world" (_Epistle to Diognetus_, vi.).[2] Under the influence of such exultation as this, which was felt to be in harmony with Christ's promise and command (Luke xxiv. 47; Matt. xxviii. 10), it was natural to use "catholic" of the universal extension of Christendom, rather than of the comprehensiveness of the truths of Christianity. And this meaning still prevails in the time of Augustine, who says that "the Church is called 'Catholic' in Greek, because it is diffused throughout the whole world" (_Epp._ lii. 1); although the later use, as meaning orthodox, in distinction to schismatical or heretical, has already begun; _e.g._ in the Muratorian Fragment, in which the writer speaks of heretical writing "which cannot be received into the Catholic Church; for wormwood is not suitable for mixing with honey" (Tregelles, pp. 20, 47; Westcott _On the Canon_, Appendix C, p. 500);[3] and the chapter in Clement of Alexandria on the priority of the Catholic Church to all heretical assemblies (_Strom._ VII. xvii).
The four Gospels and the Epistles of St. Paul were the Christian writings best known during the first century after the Ascension, and universally acknowledged as of binding authority[4]; and it was common to speak of them as "the Gospel" and "the Apostle," much in the same way as the Jews spoke of "the Law" and "the Prophets." But when a third collection of Christian documents became widely known another collective term was required by which to distinguish it from the collections already familiar, and the feature in these seven Epistles which seems to have struck the recipients of them most is the absence of an address to any local Church. Hence they received the name of Catholic, or General, or Universal Epistles. The name was all the more natural because of the number seven, which emphasized the contrast between these and the Pauline Epistles. St. Paul had written to seven particular Churches--Thessalonica, Corinth, Rome, Galatia, Philippi, Colossæ, and Ephesus; and here were seven Epistles without any address to a particular Church; therefore they might fitly be called "_General_ Epistles." Clement of Alexandria uses this term of the letter addressed to the Gentile Christians "in Antioch and Syria and Cilicia" (Acts xv. 23) by the Apostles, in the so-called Council of Jerusalem (_Strom._ IV. xv.); and Origen uses it of the Epistle of Barnabas (_Con. Celsum_ I. lxiii.), which is addressed simply to "sons and daughters," _i.e._ to Christians generally.