The Lectionary
All of the readings for a particular year are in The Lectionary (from the Latin for “reading”). This has the scripture divided into the reading for the particular celebration, be it a Sunday, a weekday, a saint’s day, or a special celebration.
The readings at Mass are divided into a 3-year cycle for the Sunday Readings, called, creatively, Year A, Year B, and Year C. The main difference is the Gospel writer that is primarily read during that Liturgical Year. In Year A , the Gospel of Mathew is read; in Year B, the Gospel of Mark; in Year C, the Gospel of Luke. The Gospel of John is read in each of the years, primarily during the Easter Season, though the “Bread of life Discourse” is read in the midst of Year B, since Mark has less material than the other gospels.
For the weekdays it is a two-year cycle, Year I and Year II. During the weekdays of Ordinary Time, parts of all four Gospels are read through the year: Mark, then Matthew, and then Luke. John is read during the last weeks of Lent and through the Easter Season. In Advent and Lent, there is no one particular gospel read, the gospel varies. The first reading changes depending on the cycle, but the gospel reading stays the same each year. To offer an example: on Monday the 13th Week of Ordinary Time, in both Year I and Year II, the Gospel is Matthew 8:18-21; in Year I the first reading is Genesis 18:16-33, in year II it is Amos 2:6-10, 13-16.
Though the entire bible is not read through the cycles (if you’ve ever tried to get through the Book of Numbers, you’ll know this isn’t a bad thing), the greater portion of it is read. This fact really deflates the claim that Catholics don’t read the bible.
