San Juan Crisóstomo o San Juan de Antioquía (347-407), obispo de Constantinopla, es considerado Padre de la Iglesia junto con Basilio el Grande y Gregorio Nacianceno. Contribuyó con su palabra y escritos, al enriquecimiento de la teología cristiana y de su elocuencia proviene su apelativo, (Crisóstomo o “boca de oro”). En las “Homilías sobre el Evangelio según San Juan” nos regala precisamente su elocuencia en el explicar verso por verso o bien algún pasaje más o menos completo de dicho evangelio; pero en vez de fijarse tanto e insistir en la enmienda de las costumbres, parece hacerlo con el fin de instruir a los herejes de su tiempo en Antioquía, en especial los anomeos, tocando puntos doctrinales controvertidos. Igualmente recalca la coherencia que debe de existir entre el conocimiento de la escritura y la vida existencial de los fieles. Es importante hacer referencia que este evangelio de San Juan se distingue de los otros evangelios por relatar otros milagros que los otros evangelistas ignoran, por tener largos discursos y por una cristología mucho más desarrollada especialmente sobre la divinidad de Cristo.
John Chrysostom (c. 347–407, Greek: Ἰωάννης ὁ Χρυσόστομος), Archbishop of Constantinople, was an important Early Church Father. He is known for his eloquence in preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, the Divine Liturgy of St. John Chrysostom, and his ascetic sensibilities. After his death in 407 (or, according to some sources, during his life) he was given the Greek epithet chrysostomos, meaning "golden mouthed", in English and Anglicized to Chrysostom.
The Orthodox and Eastern Catholic Churches honor him as a saint and count him among the Three Holy Hierarchs, together with Basil the Great and Gregory Nazianzus. He is recognized by the Eastern Orthodox Church and the Catholic Church as a saint and as a Doctor of the Church. Churches of the Western tradition, including the Roman Catholic Church, some Anglican provinces, and parts of the Lutheran Church, commemorate him on 13 September. Some Lutheran and many Anglican provinces commemorate him on the traditional Eastern feast day of 27 January. The Coptic Orthodox Church of Alexandria also recognizes John Chrysostom as a saint (with feast days on 16 Thout and 17 Hathor).
John is known in Christianity chiefly as a preacher, theologian and liturgist. Among his homilies, eight directed against Judaizing Christians remain controversial for their impact on the development of Christian antisemitism.