Well we got also a fourth group of mysteries, the Mysteries of Light, where would you fit those in?
The original three sets of mysteries have been around about 800 years, and the dates of these feasts on the calendar even longer. The Luminous mysteries, in Church time, have been around about 15 minutes. They don’t fit in the liturgical pattern—and that’s ok, though they certainly add something of value. Incarnation-Passion-Eternity captures all that is most essential, and what served for 800 years is still worth reflecting on from time to time.