A MYSTERY is a sacred thing which is difficult to understand. The works of Our Lord Jesus Christ are all sacred and Divine because He is God and man at one and the same time. The works of the Most Blessed Virgin are very holy because she is the most perfect and the most pure of God's creatures. The works of Our Lord and of His Blessed Mother can be rightly called mysteries because they are so full of wonders and all kinds of perfections and deep and sublime truths which the Holy Spirit reveals to the humble and simple souls who honor these mysteries.
The works of Jesus and Mary can also be called wonderful flowers; but their perfume and beauty can only be appreciated by those who study them carefully----and who open them and drink in their scent by diligent and sincere meditation.
Saint Dominic has divided up the lives of Our Lord and Our Lady into fifteen mysteries which stand for their virtues and their most important actions. These are the fifteen tableaux ; or pictures whose every detail must rule and inspire our lives. They are fifteen flaming torches to guide our steps throughout this earthly life.
They are fifteen shining mirrors which help us to know Jesus and Mary and to know ourselves as well. They will also help light the fire of their love in our hearts.
They are fifteen fiery furnaces which can consume us completely in their heavenly flames.
Our Lady taught Saint Dominic this excellent method of praying and ordered him to preach it far and wide so as to reawaken the fervor of Christians and to revive in their hearts a love for Our Blessed Lord.
She also taught it to Blessed Alan de la Roche and said to him in a vision: "When people say one hundred and fifty Angelic Salutations this prayer is very helpful to them and is a very pleasing tribute to me. But they will do better still and will please me even more if they say these salutations while meditating on the life, death and passion of Jesus Christ----for this meditation is the soul of this prayer."
For, in reality, the Rosary said without meditating on the sacred mysteries of our salvation would be almost like a body without a soul: excellent matter but without the form which is meditation----this latter being that which sets it apart from all other devotions.
The first part of the Rosary contains five mysteries: the first is the Annunciation of the Archangel Saint Gabriel to Our Lady; the second, the Visitation of Our Lady to her cousin Saint Elizabeth; the third, the Nativity of Jesus Christ; the fourth, the Presentation of the Child Jesus in the temple and the Purification of Our Lady; and the fifth, the Finding of Jesus in the Temple among the doctors.
These are called the JOYFUL MYSTERIES because of the joy which they gave to the whole universe. Our Lady and the Angels were overwhelmed with joy the moment when the Son of God was incarnate. Saint Elizabeth and Saint John the Baptist were filled with joy by the visit of Jesus and Mary. Heaven and earth rejoiced at the birth of Our Savior. Holy Simeon felt great consolation and was filled with joy when he took the Holy Child in his arms. The doctors were lost in admiration and wonderment at the answers which Jesus gave----and how could anyone describe the joy of Mary and Joseph when they found the Child Jesus after He had been lost for three days?
The second part of the Rosary is also composed of five mysteries which are called the SORROWFUL MYSTERIES because they show us Our Lord weighed down with sadness, covered with wounds, laden with insults, sufferings and torments. The first of these mysteries is Jesus' Prayer and Agony in the Garden of Olives; the second, His Scourging; the third, His Crowning with Thorns; the fourth, Jesus carrying His Cross; and the fifth, His Crucifixion and Death on Mount Calvary.
The third part of the Rosary contains five other mysteries which are called the GLORIOUS MYSTERIES because when we say them we meditate on Jesus and Mary in their triumph and glory. The first is the Resurrection of Jesus Christ; the second, His Ascension into Heaven; the third, the Descent of the Holy Ghost upon the Apostles; the fourth, Our Lady's glorious Assumption into Heaven; and the fifth, her Crowning in Heaven.
These are the fifteen fragrant flowers of the Mystical Rose Tree; devout souls fly to them like wise bees, so as to gather their nectar and make the honey of a solid devotion.
From page 54, 55 and 56
Nihil Obstat, Gulielmus F. Hughes, S.T.L., Censor Librorium
Imprimatur, Thomas Edmundus Molloy, S.T.D., Archiepiscopus-Episcopus Brooklyniensis, 1954 For more, see The Holy Rosary
St. Louis-Marie Grignon de Montfort's The Secret of the Rosary