The Rosary Prayer

During my research on the Rosary, I came across a prayer called "The Rosary Prayer" which is an optional prayer to add at the conclusion of the Rosary.  I very rarely hear it recited, but it is such a beautiful way to end Our Lady's favorite prayer.  My goal is to memorize it and to begin incorporating it into my Rosary devotion.  Maybe you can too (if you don't already).  I especially like the invocation of the Two Hears at the end.  Here it is:

The Rosary Prayer

(Verse) Let us pray:

(Response) O God, whose only begotten Son, by His life, death, and resurrection, has purchased for us the rewards of eternal salvation. Grant, we beseech Thee, that while meditating on these mysteries of the most holy Rosary of the Blessed Virgin Mary, that we may both imitate what they contain and obtain what they promise, through Christ our Lord. Amen.

(Verse) Most Sacred Heart of Jesus,

(Response) Have mercy on us.

(Verse) Immaculate Heart of Mary,

(Response) Pray for us.