Laurence, his first deacon, seeing him led to death, exclaimed: "Why do you abandon me, Father, you who never offer the holy sacrifice without your deacon? " "You will follow me in three days," replied Sixtus. The anniversary of the martyrdom of St Laurence will be solemnized in three days.
Sapientiam sanctorum narrent populi, et laudes eorum nuntiet Ecclesia: nomina autem eorum vivent in saeculum saeculi. * Exsultate, justi, in Domino: rectos decet collaudatio.
Let the people show forth the wisdom of the saints, and the Church declare their praise: and their names shall live unto generation and generation. * Rejoice in the Lord, O ye just: praise becometh the upright.
(Ecclesiasticus 44:15,14 and Psalm 32:1 from the introit of Mass)
Deus, qui nos concedis sanctorum Martyrum tuorum Xysti, Felicissimi et Agapiti natalitia colere: da nobis in aeterna beatitudine de eorum societate gaudere.
O God, who grantest us to celebrate the heavenly birthdays of Thy holy martyrs N. and N., vouchsafe that we may enjoy their fellowship in everlasting bliss.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/14031c.htm