The Roman Missal: Proper of Saints, May and June (English) 44
1[June 25. St William, Abbot, Confessor.—Double.]
2[Mass.—Os justi for Abbots, page xl, except—]
3Prayer. Deus qui infirmitati. O God, who hast given us in thy saints an example and patronage to our weakness to assist us to tread the path of salvation; grant us to venerate the merits of the blessed Abbot William, that we may obtain his intercession, and pursue his footsteps. Through our Lord, &c.
4[Then a Commemoration of the Octave of St John, as in the preceding Mass.]