Information is from the Canon Regulars of St. John Cantius:
In the past, people used to prepare with prayer and fasting throughout the night before coming to this Station, which takes place in the major church of Christendom, at the tomb of the Prince of the Apostles.
It was at this Station that the Pope consecrated priests, joining to the Sacrament of the Holy Eucharist that of the Ordination of Priests. The monumentality of the Basilica and the columned square, which embraces the vast crowds like immense arms, is only a framework to the great light, which from here radiates to all the world.
St. Peter, rock of the Church, bearer of the keys of God's Kingdom, great priest of Jesus Christ, holy shepherd of His flock, bless those who are called to be fishers of men.
Let us pray: Direct our actions, we beseech Thee, O Lord, by Thy inspiration and further them with Thy continual help; that every prayer of ours may begin always from Thee and through Thee likewise be ended. Through Christ, Our Lord.