Let’s have a look at the Collect for the upcoming Sunday in the TLM – 1962 Missale Romanum.
This Collect has been in use at least since the time of the Liber Sacramentorum Gellonensis, which is a variation of the ancient Gelasian sacramentaries of the Frankish tradition. It survived the Novus Ordo Cutter-Snippers as the Collect for the 5th Sunday of Ordinary Time.
COLLECT (1962MR)
Familiam tuam, quaesumus,
Domine, continua pietate custodi:
ut a cunctis adversitatibus, te protegente, sit libera;
et in bonis actibus tuo nomini sit devota.
The first part was used almost like a template in other prayers, as in the Collect of the 5th Sunday after Epiphany: “Familiam tuam, quaesumus, Domine, continua pietate custodi, ut, quae in sola spe gratiae caelestis innititur, tua semper protectione muniatur.”
Note not only the similar beginning, but also a connection in the vocabulary with that form of protego. This suggests to me that the prayers are related.
That word familia, though it seems so familiar, should have some attention.
Familia and forms of famulus occur often in our prayers. Think of the line in the Roman Canon including “Memento, Domine, famulorum, famularumque tuarum… Be mindful, O Lord, of Your household servants and handmaids”. These words look like “family”, as does familia, and that is often appropriate depending on the context. However, the core meaning of the root of the word, fama, which comes from Latin’s ancient cousin Oscan must guide our minds to the whole body of people in an ancient household, including especially the servants. The different words for “family” in Latin include all the servants and staff, with the extended family, not just the core. The paterfamilias, “father of the family” had virtual power of life and death over most of his household and his word was law.
Custodio, common in military language, means “to watch, protect, keep, defend, guard”. Pietas is complicated, as we have seen many times. Obvious English “piety” comes from this, but the Latin is more involved. Your helpful Lewis & Short Dictionary says pietas is “dutiful conduct toward the gods, one’s parents, relatives, benefactors, country, etc., sense of duty.” The classic application of pietas and the adjective pius is to the figure of Aeneas in the Latin poet Virgil’s Aeneid. As Troy was being destroyed by the Greeks after the incident with the wooden horse, Virgil (+19 BC) has Aeneas carry his elderly father Anchises, with the family tutelary god, from the wreckage of the burning city while leading his little son along by hand. This image of the man with his father on his back and his son by the hand perfectly expresses the duties Aeneas, future founder of what will become Rome, had toward his family, his pietas. He was also scrupulous in relation to the gods. So he is usually called pius Aeneas, which as you now know is far more complicated than the mere “pious Aeneas”.
Christians adapted ancient terms like this to a new context, to express new meanings. In Jerome’s Vulgate in both Old and New Testament pietas is “conscientiousness, scrupulousness regarding love and duty toward God.” You see that the core of pietas remains “duty.” Pietas is also one of the seven gifts of the Holy Spirit (cf. CCC 1831; Isaiah 11:2), by which we are duly affectionate and grateful toward our parents, relatives and country, as well as to all men living insofar as they belong to God or are godly, and especially to the saints. In loose or common parlance, “piety” indicates fulfilling the duties of religion. Sometimes “pious” is even used in a negative way, as when people take aim at external displays of religious dutifulness as opposed to what they is “genuine” practice (cf. Luke 18:9-14).
All this is involved when we use pietas to describe ourselves, what human beings have regarding, God, family, country, etc. But in our prayer today, we are asking God to guard us with His pietas.
When we speak of the pietas of God, we are generally referring to His mercy toward us. While it is not strictly right to imply that God has a duty toward us, He has made promises and God is true to His promises. We can depend on Him not because He is obliged by pietas, as we are, but because He is loving and merciful. So, God’s pietas towards us has a different tone altogether.
St. Thomas Aquinas explains how the gift of piety perfects the disposition by which we render reverence and service to God as Father (STh II-II, q. 121, a. 1, ). God owes nothing to creatures considered in themselves. Nevertheless, because He has freely made promises, He is faithful to His own word. The divine pietas of this prayer expresses both His merciful care and His unwavering fidelity.
I note as well that in that line from the Canon I quoted above in respect to familia, down the line a bit, we come to the Latin word devotio. We have a form of that word in today’s Collect. There must be a connection between the concepts of familia, pietas and devota, an adjective connected with familia.
Your L&S reveals that devoto “to dedicate, devote” as well as “to bewitch, enchant” and, in a related sense, “to invoke with vows”, and by logical extension it comes to mean “to curse”, though clearly today’s use doesn’t bear that connotation. In the French source for liturgical Latin we call Blaise/Dumas, we find that the adjective devotus, a, um has a special connection to devotion to service of the Lord. We can also draw insight into what is really being said here by bringing in the force of devotio, an obvious derivative. In classical usage devotio is “fealty, allegiance, devotedness; piety, devotion, zeal.” Devotio also means, as devoto implied, “a cursing, curse, imprecation, execration, a magical formula, incantation, spell.” Again, that is not our direction today. Briefly, I hear devotio as “a devotion to duty”. In that sense it picks up the meaning of pietas. Our “devotion” leads us to keep God’s commandments and attend with focus to the duties of our state before all else. If we are truly devout, pious, in respect to God, devoted to fulfilling the duties of our state in life truly is here and now, then God will give us every actual grace we need to fulfill our vocations. We are, in effect, fulfilling our proper role in His great plan and thus He is sure to help us.
God fulfills what He promises to us as we do our part in His plan in which He gave us a role from before the creation of the universe.
LITERAL TRANSLATION:
Guard your family, we beseech you,
O Lord, with continual mercy,
so that it may be free from all adversities
as You are protecting it,
and, in its good acts, may be devoted in Your Name.
This prayer speaks first of all to how interconnected we are as Catholic Christians.
By baptism, we are the adopted children of the Father. We look to Him with the reverence of children, not merely as cowering slaves. We belong to a family. In the arc of our lives we have roles and states to fulfill. Within the Church we have our manner of participation. We are all in this together. My strengths support yours. My sins weaken us all. My defeats become your concern. All our triumphs are shared as we raise them up to God.
In remembering our common bonds with each other in the Father, we must also remember a profound inequality in our bonds – children are no less members of the family than parents, but they are dependent they are not the equals of their parents. God is not our peer. We are not His equal. We are all children before His gaze.
I am amused and horrified when I hear modernists, progressivist types suggest that modern man is all grown up now and that we no longer have to kneel as if cowering before a stern master God.
Our prayer gives us an image that runs very much contrary to the prevailing values of the last few decades, a period in which the family as a coherent recognizable unit has been systematically broken down.
Our Latin prayers often reflect the Church’s profound awareness of our lack of equality with God.
The prayers are radically hierarchical, just as God’s design reveals hierarchy and order.
The prayers are imbued with reverence.
Compare this attitude with prevailing societal norms.
Compare this with our ongoing trial by “synodality” (“walking togetherity”).
Lastly, it seems to me that there is a possible connection between the Collect and the Epistle of this very Sunday. In Ephesians 6:10–17, St. Paul urges Christians to put on the whole armor of God so that they may be protected from the attacks of the devil. The Collect asks God to protect His household from every adversity. Custodi, protegentе, and libera fit with the military language of the Epistle: armaturam Dei, insidias diaboli, scutum fidei, and galeam salutis.
The Church is God’s household, certainly, but also His army in the midst of spiritual combat. Her members are protected by God precisely so that they can do their duty.
From a reader…
Today our yellow star appeared to rise over Rome at 07:19.
Hodie sol super septem colles ortus est hora VII et XVIII minutis, occasurus hora XVIII et XXXIV minutis.
On this 12th day of my Roman sojourn, the 285th day of the year, the sun rose over the seven hills at 07:17, casting its first golden benediction upon increasingly dark domes, bell towers, and the ever more loathsome seagulls.
And… this video (below) concerns THE BOOK, the “Five Cardinals Book” – 
johntenor on A matter of grave concern: People who pray together before or after Mass.: “The same people who gave us the Snoopy prayer during Mass are uncomfortable with the St Michael Prayer after Mass.”
