Remember that Our Lady gave us this Devotion
From The Secret Of The Rosary, by St. Louis De Montfort
The prayers of the Rosary
The rosary is made up of two things: mental prayer and vocal prayer. In the Holy Rosary mental prayer is none other than meditation of the chief mysteries of the life, death and glory of Jesus Christ and of His Blessed Mother. Vocal prayer consists in saying fifteen decades of the Hail Mary, each decade headed by an Our Father, while at the same time meditating on and contemplating the fifteen principal virtues which Jesus and Mary practised in the fifteen mysteries of the Holy Rosary.
In the first five decades we must honor the five Joyous Mysteries and meditate on them; in the second five decades the Sorrowful Mysteries and in the third group of five, the Glorious Mysteries. So the Rosary is a blessed blending of mental and vocal prayer by which we honor and learn to imitate the mysteries and virtues of the life, death, passion and glory of Jesus and Mary.
The Twenty-First Rose
… 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 the 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. …