The 4 Evangelists

Today being the feats of Saint John, the Evangelist and Apostle, I thought it would be a good idea to share with you the meaning of the symbols connected to each of the 4 Evangelists.
In iconography, the evangelists often are represented by 4 symbols, which originate from the four "living creatures" that appears in the vision in the Book of Ezekiel (Chapter 1) reflected in the Book of Revelation (4.6-9ff), though neither source links the creatures to the Evangelists. They are normally, but not invariably, all shown with wings like angels. One might note that these animals may have originally have been seen as representing the highest forms of the various types of animals, i.e., man, the king of creation as the image of the Creator; the lion as the king of beasts of prey (meat eating); the ox as the king of domesticated animals (grass eating) and the eagle as the king of the birds.

Matthew the Evangelist, the author of the first gospel account is symbolized by a winged man, or angel. Matthew's gospel starts with Jesus' genealogy from Abraham; it represents Jesus' Incarnation, and so Christ's human nature. This signifies that Christians should use their reason for salvation.
Mark the Evangelist, the author of the second gospel account is symbolized by a winged lion – a figure of courage and monarchy. Mark has John the Baptist preaching "like a lion roaring" at the beginning of his Gospel. It also represents Jesus' Resurrection (because lions were believed to sleep with open eyes, a comparison with Christ in the tomb), and Christ as king. This signifies that Christians should be courageous on the path of salvation.

Luke the Evangelist, the author of the third gospel account (and the Acts of the Apostles) is symbolized by a winged ox or bull – a figure of sacrifice, service and strength. Luke's account begins with the duties of Zacharias in the temple; it represents Jesus' sacrifice in His Passion and Crucifixion, as well as Christ being High priest (this also represents Mary's obedience). The ox signifies that Christians should be prepared to sacrifice themselves in following Christ.
John the Evangelist, the author of the fourth gospel account is symbolized by an eagle – a figure of the sky, and believed to be able to look straight into the sun. John starts with an eternal overview of Jesus the Logos (Word) and goes on to describe many things with a "higher" level than the other three (synoptic) gospels; it represents Jesus' Ascension, and Christ's divine nature. This represents that Christians should look on eternity without flinching as they journey towards their goal of union with God.

When surrounding Christ, the figure of the man is usually at top left – above Christ's right hand, with the lion above Christ's left arm. Underneath the man is the ox and underneath the lion is the eagle. This both reflects the medieval idea of the order of "nobility" of nature of the beasts (man, lion, ox, eagle) and the text of Ezekiel 1.10.