These windows portray the four Gospel writers. There are many interpretations of these symbols, but today the usual explanation is as follows:

St. Matthew, the winged man, signifies the human nature of our Lord, stressed by Matthew in his Gospel which begins by tracing the human descent of Jesus.

The winged lion denotes St. Mark who opens his Gospel by describing John the Baptist who was the voice of one crying in the wilderness. Also, the lion is known as the king of the forest, and Mark presents not only a king eternal in the heavens, but one also walking the ways of the earth.

The winged ox represents St. Luke. Luke presents in his Gospel a Christ of sacrifice for man's sins - a Christ who was to become the sacrifice and oblation for the sins of the world.

The winged eagle symbolizes St. John. As the eagle is the kin of the air, able to soar above a other birds over the earth, so it is the symbol of a Christ who towers above all others for all time.

Each of the winged forms holds a book, symbolizing the individual gospels.