The Divine Office is mostly Scripture, so it has to come from a book, of course. For example, vespers consists of an invocation, a hymn, three psalms, a short prose scripture reading, a short "responsory", the Magnificat from Luke 1, intercessions, and a closing prayer. Six of the ten items in my list are Scripture, either sung or read.
Oh, I get that some people do not know who to pray and may need help.
I just do not understand it.
Personally, I think God want from the heart what is troubling us or what we desire...
just to follow the Lord’s prayer if one does not know where to start, is just fine.
Matthew 6:9-13
(KJV)
9 After this manner therefore pray ye:
Our Father which art in heaven, Hallowed be thy name.
10 Thy kingdom come, Thy will be done in earth, as it is in heaven.
11 Give us this day our daily bread.
12 And forgive us our debts, as we forgive our debtors.
13 And lead us not into temptation, but deliver us from evil: For thine is the kingdom, and the power, and the glory, for ever. Amen.