The Roman Missal: Proper of Saints, August (English) 18
1[August 17. Octave of St Laurence, Martyr.—Double.]
2[Mass, as on the Feast, page 665, except—]
5[Commemoration of the Octave of the Assumption as on the Feast, page 670.]
7[The Credo is said, on account of the Octave of the Assumption.]
8Offertory. In thy strength, O Lord, the just shall joy, and in thy salvation he shall rejoice exceedingly: thou hast given him his soul's desire.
9Secret. We beseech thee, O Lord, that the holy prayer of the blessed Laurence may render our sacrifice pleasing to thee; that it may be accepted by his merits, in whose honour it is solemnly offered. Through our Lord, &c.
10[Commemoration of the Octave of the Assumption; as on the Feast.]
11Communion. He that will come after me, let him deny himself, and take up his cross, and follow me.
12Postcom. Supplices. We suppliantly beseech thee, Almighty God, that thou wouldst preserve by perpetual protection, by the intercession of blessed Laurence thy martyr, those whom thou hast replenished with heavenly gifts. Through our Lord, &c.
13[Commemoration of the Octave of the Assumption, as on the Feast.]