S. Callisti Papæ et Martyris ~ Duplex

:Feria Tertia infra Hebdomadam XVIII post Octavam Pentecostes III. Octobris

Tues, 10/14/25:

Today is the feast of St. Callistus I, P & M, under the 1954 (double) and 1962 (III class) rubrics. Mass: Si diligis me of a supreme pontiff with proper orations. Red. Gloria. Gradual/Alleluia. Omit Credo. Preface of the Apostles (1954)/Common Preface (1962). Ite. No commemorations. Office: Ordinary office. Red. Matins of 3 nocturns of 9 lessons (1954)/1 nocturn of 3 lessons (1962; II = II & III of occurring Scripture combined, III = short hagiography). Te Deum. Psalms and antiphons of the feria. All else from the common of one martyr outside Paschaltide. Proper collect. No commemorations at Lauds. Omit suffrage (1954).

Introitus
Joann 21:15-17
Si díligis me, Simon Petre, pasce agnos meos, pasce oves meas.
Ps 29:2
Exaltábo te, Dómine, quóniam suscepísti me, nec delectásti inimícos meos super me.
℣. Glória Patri, …

Collect
℣. The Lord be with you.
℟. And with thy spirit.
Let us pray.
O God, Who behold how we fail in our weakness, mercifully restore us to Your love through the examples of Your Saints.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.

From the Holy Gospel according to Matthew
Matt 16:13-19
At that time: When Jesus came into the coasts of Caesarea Philippi, he asked his disciples, saying, Whom do men say that I the Son of man am? And so on.

A Homily by St. Leo the Pope
Sermo 2 in anniversario assumpt. suæ ante medium
When the Lord, as we read in the Gospel, asked his disciples who did men, amid their diverse speculations, believe him the Son of Man to be, blessed Peter answered and said: Thou art the Christ, the Son of the living God. And the Lord answered and said unto him: Blessed art thou, Simon Bar-Jona: for flesh and blood hath not revealed it unto thee, but my Father, which is in heaven: and I say also unto thee: That thou art Peter, and upon this rock I will build my Church, and the gates of hell shall not prevail against it; and I will give unto thee the keys of the kingdom of heaven; and whatsoever thou shalt bind on earth shall be bound in heaven; and whatsoever thou shalt loose on earth shall be loosed in heaven. But the dispensation of truth perdures, and blessed Peter, persevering in the strength of the rock which he hath received, hath not relinquished the position he assumed at the helm of the Church.

Post Communion
P. The Lord be with you.
S. And with thy spirit.
Let us pray.
We beseech You, almighty God, that these consecrated gifts may cleanse us of our sins and by their effect make us lead holy lives.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.