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The word Catholic (katholikos from katholou — throughout the whole, i.e., universal) cf. CATHOLIC ENCYCLOPEDIA: Catholic
The Catholic Letters After the thirteen letters of St. Paul and the letter to the Hebrews come seven other letters (one by St. James, two by St. Peter, three by St. John, and one by St. Jude) which since the time of Origen, Eusebius and St. Jerome have been known as 'catholic' letters, letters to the Church at large, not directed to a particular church or individual: the second and third letters of St. John, even though they are addressed to a private individual are regarded as appendixes to his first letter and are also included in the 'catholic letters' category. cf. A GUIDE TO THE BIBLE | Antonio Fuentes