Today is the feast of St John the Evangelist, the patron of my church. The Fathers of the Church believed John the Evangelist was the author of the Gospel, three Epistles, and the Book of Revelation, and the same person as John the Apostle and John of Patmos. Later scholars suggest rather that a disciple of John the Apostle wrote the Gospel and three Epistles and that John of Patmos was a different person, because the writing style of the Book of Revelation is too different from the Gospel and Epistles.
Pictured above is the stained glass window at St. John's Episcopal Church in Thibodaux. If you click on the picture, you see (somewhat blurred) the detail in the glass which shows a snake coming out of the goblet in John's hand. According to legend, the emperor Domitian offered poisoned wine to John, but he blessed the wine and the poison came out of the goblet in the form of a snake. A painting by El Greco illustrates the same legend.
Collect of the day
Shed upon your Church, O Lord, the brightness of your light; that we, being illumined by the teaching of your apostle and evangelist John, may so walk in the light of your truth, that at length we may attain to the fullness of eternal life, through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.