From Dom Prosper Guéranger's The Liturgical Year.
28 June 2023
The Vigil of the Holy Apostles Sts Peter and Paul
the Baptist, placed on the confines of the two Testaments, closes the prophetic age, the reign of Hope, and opens the era of Faith which possesses the long expected God, though as yet without beholding him in his Divinity. Thus even before the Octave is ended, wherein we pay our homage to the son of Zachary, the apostolic confession comes grafting itself on the testimony rendered by the Precursor to the Word, the Light. Tomorrow all heaven will re-echo with the solemn protestation first heard at Cesarea Philippi: Thou art Christ, the Son of the Living God; and Simon Bar-Jona, because of this oracle uttered by him, will be the chosen Rock supporting the divine structure, the Church. Tomorrow he will die, sealing this glorious declaration with his very blood; but he will yet live on, in the person of each Roman Pontiff, that he may thus guard this precious testimony of his in all its integrity, even unto the day when faith will give place to the Eternal Vision. Coupled with Peter in his labors, the “Doctor of the Gentiles” shares his triumph this day; and Rome, more indebted to these her two Princes than to all her stout warriors of old, who laid the world prostrate at her feet, beholds their double victory fix for ever upon her noble brow the diadem of spiritual royalty.