[Officium]
St. Callistus, Pope and Martyr

[Oratio]
O God, Who behold how we fail in our weakness, mercifully restore us to Your love through the examples of Your Saints.
$Per Dominum

[Secreta]
May this sacrificial offering help to cleanse us of our sins, O Lord, and to assure us of Your everlasting salvation.
$Per Dominum

[Postcommunio]
We beseech You, almighty God, that these consecrated gifts may cleanse us of our sins and by their effect make us lead holy lives.
$Per Dominum
