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Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”

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Views from the Choir Loft

Blessed are the Peacemakers

Dr. Peter Kwasniewski · July 4, 2013

AINT THOMAS AQUINAS interprets the Lord’s words “Blessed are the clean of heart” in terms of perfection within oneself, as a necessary disposition to heavenly beatitude (cf. Summa Ia-IIae, Question 69); and he interprets “Blessed are the peacemakers” in terms of perfection towards others, since the work proper to peace is the uniting or harmonizing of what is separated or discordant in human relationships.

Having a clean heart is a prerequisite to being a peacemaker, since knowing what peace truly consists in follows from having a well-ordered or “peaceful” soul. Aristotle makes the same point in the Nicomachean Ethics, where he discusses the wicked man who is at odds with himself, who is fragmented and restless in his consciousness, as opposed to the virtuous man who is at peace—not, mind you, smug or self-satisfied, since he goads himself on to do virtuous deeds (the greater the better); but rather, with the peace of self-possession that comes from self-mastery and habitually cleaving to the good.

Peace among men cannot come from hearts that are not at peace. Relationships of justice among men cannot arise as long as hearts are possessed of unjust desires and ambitions. “Seek first the kingdom of God, and His justice, and all these things shall be added unto you,” says the Lord. One can only promote the peace of another—peace with another and among others—if one first loves the other’s good. Peace demands a good willed for the neighbor for his sake, and the good of another can only be loved by one whose heart is already attracted to the good in itself—that is, by one whose heart is pure. As Kierkegaard once wisely said, “Purity of heart is to will one thing.” Clarity of the heart’s “eye” is what makes it possible to see how great a good peace really is and to know how to foster it; cleanness of heart is the condition of both insight and foresight.

“My peace I leave with you: not as the world gives do I give to you.” Peace of soul is something only God can give us, and without it, we are lost. Indeed, without the peace that comes from resting in God’s will, much of what we do will become harmful to us, as we injure ourselves with our own “good intentions.” It is not enough to do something generically good. We seek to do what God wills, in the manner God wills, and because He wills it: quod Deus vult, quomodo Deus vult, et quia Deus vult.

For this reason, among others, a college that is truly Catholic must pay attention to the spiritual formation of its students. They are not disembodied intellects who are taught mere conceptual doctrines, whether in theology or mathematics or any other discipline; nor are they brute animals who climb the heights to forage and fight like mountain goats. A Catholic student is, first and foremost, an adopted son of God, whose soul needs grace as a plant needs sunlight and moisture to grow, as an animal need fresh air to breathe. A Catholic college allows, beckons, beseeches Holy Mother Church, in the person of her sacred ministers, to nourish students’ souls with the Bread of Angels, to heal their hearts with the absolving balm of Confession, to guide their steps with the reflected light of spiritual direction, to surround them with all the great and small reminders of our true origin and destiny, our Alpha and Omega. She makes this an explicit goal of her institutional life and culture.

True, a college as such exists to offer an academic curriculum. A Catholic college, however, must do more, and joyfully does more: it is not one-dimensional but three-dimensional. It offers a spiritual training ground in which the immediate goal of academic formation, of cultivating intellectual virtues, comes together with ongoing formation in and exercise of the moral and theological virtues. This tightly-knit threefold cord of theological virtue, intellectual virtue, and moral virtue is what binds into unity the many elements of a Catholic’s daily life, and in a special way, a student’s life. What a joy it is to see this unity emerge, year by year, as our students drink in peace from the Lord’s glorious wounds and seek to be peacemakers in a wounded world.

Opinions by blog authors do not necessarily represent the views of Corpus Christi Watershed.

Filed Under: Articles Last Updated: January 1, 2020

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About Dr. Peter Kwasniewski

A graduate of Thomas Aquinas College (B.A. in Liberal Arts) and The Catholic University of America (M.A. and Ph.D. in Philosophy), Dr. Peter Kwasniewski is currently Professor at Wyoming Catholic College. He is also a published and performed composer, especially of sacred music.

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Corpus Christi Watershed

President’s Corner

    PDF Download • “For Pentecost Sunday”
    Yesterday morning, I recorded myself singing the ENTRANCE CHANT for Pentecost Sunday while simultaneously accompanying myself on the pipe organ. Click here to see how that came out. At the end of the antiphon, there’s a triple Allelúja and I just love the chord at the end of the 2nd iteration. The organ accompaniment—along with the musical score for singers—can be downloaded free of charge at the flourishing feasts website. For the record, the antiphon on Pentecost Sunday doesn’t come from a psalm; it comes from the book of Wisdom.
    —Jeff Ostrowski
    PDF Download • “Organ Accompaniment”
    Over the past few years, I’ve been harmonizing all the vernacular plainsong Introit settings by the CHAUMONOT COMPOSERS GROUP. This coming Sunday—10 May 2026—is the 6th Sunday of Easter (Year A). The following declaration will probably smack of “blowing my own horn.” However, I’d rank this accompaniment as my best yet. In this rehearsal video, I attempt to sing it while simultaneously accompanying myself on the pipe organ. The musical score [for singers] as well as my organ accompaniment can be downloaded free of charge from the flourishing feasts website.
    —Jeff Ostrowski
    “Gregorian Chant Quiz” • 4 May 2026
    A few days ago, the CORPUS CHRISTI WATERSHED Facebook page posted this Gregorian Chant quiz regarding a rubric for the SEQUENCE for the feast of Corpus Christi: “Lauda Sion Salvatórem.” There is no audience more intelligent than ours—yet surprisingly nobody has been able to guess the rubric. Drop me an email with the right answer, and I’ll affirm your brilliance to everyone I encounter!
    —Jeff Ostrowski

Quick Thoughts

    “Thee” + “Thou” + “Thine”
    Few musicians realize that various English translations of Sacred Scripture were granted formal approval by the USCCB and the Vatican for liturgical use in the United States of America. But don’t take my word for it! Here are four documents proving this, which you can examine with your own eyes. Some believe the words “Thine” and “Thou” and “Thee” were forbidden after Vatican II—but that’s incorrect. For example, they’re found in the English translation of the ‘Our Father’ at Mass. Moreover, the Revised Standard Version (Catholic Edition) mentioned in those four documents employs “Thine” and “Thou” and “Thee.” It was published with a FOREWORD by Westminster’s Roman Catholic Archbishop (John Cardinal Heenan).
    —Jeff Ostrowski
    “Reminder” — Month of May (2026)
    On a daily basis, I speak to people who don’t realize we publish a free newsletter (although they’ve followed our blog for years). We have no endowment, no major donors, no savings, and refuse to run annoying ads. As a result, our mailing list is crucial to our survival. It couldn’t be easier to subscribe! Just scroll to the bottom of any blog article and enter your email address.
    —Jeff Ostrowski
    Simplified Version • “Canon in D” (Pachelbel)
    I published an article on 11 November 2023 called Wedding March For The Lazy Organist, which rather offhandedly made reference to a simplified version I created in 2007 for Pachelbel’s Canon. I often use it as a PROCESSIONAL for weddings and quinceañeras. Many organists say they “hate” Pachelbel’s Canon. But I love it. I think it’s bright and beautiful. I created that ‘simplified version’ for musicians coming to grips with playing the pipe organ. It can be downloaded as a free PDF if you visit Andrea Leal’s article dated 15 August 2022: Manuals Only: Organ Interludes Based on Plainsong. Specifically, it is page 84 in that collection—generously offered as a free PDF download. Johann Pachelbel (d. 1706) was a renowned German organist, violinist, teacher, and composer of over 500 works. A friend of Bach’s family, he taught Johann Christoph Bach (Sebastian Bach’s eldest brother) and lived in his house. Those who read Pachelbel’s biography will notice his connection to two German cities adopted as famous hymn tune names: EISENACH and ERFURT.
    —Jeff Ostrowski

Random Quote

[Speaking of those who wish to eliminate Latin from the liturgy.] “One may well wonder what the origin is of this new way of thinking and this sudden dislike for the past; one may well wonder why these things have been fostered.”

— Pope Saint Paul VI (15 August 1966)

Recent Posts

  • “Unfair Characterization” • (But Good Question)
  • “Thee” + “Thou” + “Thine”
  • PDF Download • “For Pentecost Sunday”
  • “Reminder” — Month of May (2026)
  • “Englished” Gregorian Chant • 5 Considerations

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