From Merlo’s Paradise of the Christian Soul (Paradisus Animae). He cites the learned Bible commentator Cornelius a Lapide, who loved this prayer so much he included it in his commentary on Isaiah! It apparently used to be very popular. It’s not the same as the rosary/chaplet promoted by St. John Eudes, or the one used by Jesuits in Canada.
Cornelius said this rosary was invented by B. Nicolaus Serarius, a Jesuit. Nicholas Serarius, or Serrurier, was born in Rambervillier, Lorraine, France in 1555. He studied in Cologne, became a Jesuit, became a Biblical scholar and theologian of note, and wrote a bunch of books. He taught at Wuerzburg from 1591 until 1597, when he went to Mayence (Mentz) to teach. He died there in 1609. He was considered one of the founders of a whole school of “classic” Catholic Bible interpretation.
God the Father of Heaven, Have mercy on us.
God the Son, Redeemer of the world, Have mercy on us.
God the Holy Spirit, Have mercy on us.
Then say three decades of the Rosary, each like this:
On the big bead:
Benediction and glory, and wisdom and honor,
and thanksgiving, honor, and power and strength,
to our God for ever and ever.
On each of the ten small beads:
Holy, holy, holy, Lord God of hosts.
Heaven and earth are full of His glory.
(followed each time by:)
End of decade.
Cornelius pointed out, “We emulate, in our measure, the life and office of angels, when we thus continually renew our endeavors to praise God, since this is what the angels do incessantly in heaven, and what we shall do with them hereafter… So, in fact, we begin here to be blessed and to have our way of life in heaven, for we rise above earthly things and are occupied with God and His praises.” Praising God more should also mean thinking about our own glory and gain less, and it also allows us to give God thanks as well as praise. Serlo quotes another old prayerbook, advising people to think beforehand about what they particularly want to praise or thank God for.