I picked other, since my favourite devotion is the Divine Office (as lay people, it isn't liturgy, which requires at least a deacon.)
I love the prayer said before each Hour, which could easily be used for any other devotion:
Aperi, Dómine, os meum ad benedicéndum nomen sanctum tuum: munda quoque cor meum ab ómnibus vanis, pervérsis et aliénis cogitatiónibus; intelléctum illúmina, afféctum inflámma, ut digne, atténte ac devóte hoc Offícium [has preces] recitáre váleam, et exaudíri mérear ante conspéctum divínæ Majestátis tuæ. Per Christum Dóminum nostrum. Amen.
Dómine, in unióne illíus divínæ intentiónis, qua ipse in terris laudes Deo persolvísti, has tibi Horas (vel hanc tibi Horam vel has tibi preces) persólvo
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Open thou, O Lord, my mouth to bless thy holy Name; cleanse also my heart from all vain, evil, and wandering thoughts; enlighten my understanding; enkindle my affections; that I may say this Office [these prayers] worthily, with attention and devotion, and so be meet to be heard in the presence of thy divine Majesty. Through Christ our Lord. Amen.
O Lord, in union with that divine intention wherewith thou thyself on earth didst render thy praises to God, I desire to offer these Hours (or this hour or these prayers) unto thee.