There are several ways of saying the Holy Rosary, but that which gives Almighty God the greatest glory, does the most for our souls and which the devil fears more than any other, is that of saying or chanting the Rosary publicly in two groups.
Almighty God is very pleased to have people gathered together in prayer; the angels and the blessed unite to praise Him unceasingly. The just on earth in several communities join in communal prayer night and day. Our Blessed Lord expressly recommended common prayer to His apostles and disciples and promised that whenever two or three were gathered together in His name He would be there in the midst of them (Cf. Mt. 18:20).
What a wonderful thing to have Jesus Christ in our midst! And the only thing we have to do to get Him to come is to say the Rosary in a group. This is why the early Christians often gathered together to pray in spite of all the Roman Emperor’s persecutions and the fact that assemblies were forbidden. They preferred to risk the danger of death rather than to miss their gatherings, at which Our Lord was present.
This way of praying is of the greatest benefit to our souls because:
1. Normally our minds are far more alert during public prayer than they are when we pray atone.
2. When we pray in common, the prayer of each one belongs to us all and these make but one great prayer together, so that if one person is not praying well, someone else in the same gathering who prays better may make up for his deficiency. In this way those who are strong uphold the weak, those who are fervent inspire the lukewarm, the rich enrich the poor, the bad are counted as good. How can a measure of cockle be sold? This can be done very easily by mixing it up with four or five barrels of good wheat.
3. Somebody who says his Rosary alone only gains the merit of one Rosary, but if he says it together with thirty other people he gains the merit of thirty Rosaries. This is the law of public prayer. How profitable, how advantageous this is!
4. Urban VIII, who was very pleased to see how devotion to the Holy Rosary had spread in Rome and how it was being said in two groups or choirs, particularly at the convent of Santa Maria Sopra Minerva, attached one hundred days’ extra indulgence, toties quoties, whenever the Rosary was said in two choirs. This was set out in his brief “Ad perpetuam rei memoriam,” written in the year 1626. So every time you say the Rosary in two groups you gain one hundred days’ extra indulgence.
5. Public prayer is far more powerful than private prayer to appease the anger of God and call down His Mercy, and Holy Mother Church, guided by the Holy Spirit, has always advocated public prayer in times of public tragedy and suffering.
In his bull on the Rosary, Pope Gregory XIII says very clearly that we must believe (on pious faith) that the public prayers and processions of members of the Confraternity of the Holy Rosary were largely responsible for the great victory over the Turkish navy at Lepanto which Almighty God granted to Christians on the first Sunday of October, 1571.
When King Louis the Just, of blessed memory, was besieging La Rochelle, where the revolutionary heretics had their stronghold, he wrote to his mother to beg her to have public prayers offered for a victorious outcome. The Queen-Mother decided to have the Rosary recited publicly in Paris in the Dominican Church of Faubourg Saint Honore and this was done by the Archbishop of Paris. It was begun on May 20th, 1628.