In the Catholic liturgical calendar, every month has a special devotion to which it’s dedicated. Here’s a list.
July is dedicated to the Most Precious Blood of Jesus.
In 1960, Pope John XXIII issued an apostolic letter on the subject. It’s here, and here’s an excerpt:
From the very outset of our pontificate, in speaking of daily devotions we have repeatedly urged the faithful (often in eager tones that frankly hinted our future design) to cherish warmly that marvellous manifestation of divine mercy toward individuals and Holy Church and the whole world redeemed and saved by Jesus Christ: we mean devotion to his Most Precious Blood.
From infancy this devotion was instilled in us within our own household. Fondly we still recall how our parents used to recite the Litany of the Most Precious Blood every day during July.
It’s an interesting letter, more for what is indicates about the thinking about liturgical reform on the cusp of the council than about the Precious Blood. You can sense all sorts of threads being woven, different, but related concerns bubbling: not wanting to weaken popular devotion, but also wanting to make sure it’s soundly rooted and coherent, wary of a devotional hodge-podge, emphasizing that yes, it flows organically from you guys, but remember who’s got the final say, and finally, an anxiety about the impact of the Church and Catholics on the world – this should make you stronger witnesses….but don’t forget we’re in charge….make it vigorous, but don’t go crazy, please.
The litany promulgated by John XXIII in 1960.
(Remember, this is the first page of the entry. There’s a second page, facing, with a more in-depth explanation)

Of course, devotion to the Precious Blood has a firm place in Catholic spirituality, as distasteful as it might be the modern mind. But then we get – as we often do- to the irony of the discomfort. Many of us grew up hearing it was important to focus on Jesus’ humanity – well, there you have some humanity: blood.
One of the many saints with a special devotion to the Precious Blood was Catherine of Siena. In my book Praying with the Pivotal Players, written to accompany Bishop Barron’s first Pivotal Players video series, I’ve got a chapter on blood. An excerpt and then page scans:
Blood. Some of us are wary of the sight of it or even repulsed, but in Catherine’s landscape, there is no turning away. The biological truth that blood is life and the transcendent truth that the blood of Christ is eternal life are deeply embedded in her spirituality. We see these truths in the Dialogue, in passages like the one above, and even in her correspondence.
For in her letters, Catherine usually begins by immediately setting the context of the message that is about to come: Catherine, servant and slave of the servants of Jesus Christ, write to you in his precious blood….
The salutation is followed by a brief statement of her purpose, which, by virtue of Catherine’s initial positioning of her words in the context of the life-giving blood of Jesus, bear special weight and authority: in his precious blood… desiring to see you a true servant….desiring to see you obedient daughters…desiring to see you burning and consumed in his blazing love…desiring to see you clothed in true and perfect humility….
In both the Dialogue and her letters, Catherine takes this fundamental truth about salvation – that it comes to us through the death, that is, the blood of Christ – and works with it in vivid, startling ways. She meets the challenges of describing the agonies and ecstasies of the spiritual life with rich, even wild metaphors, and the redemptive blood of Christ plays its part here. For as she describes this life of a disciple, we meet Christ’s friends, followers, sheep, lovers as those drunk on his blood, inebriated. They are washed in the blood and they even drown in it….



Note: The book is out of print, and you can purchase used copies on Amazon (hence my rare Amazon link here). Note, please, however, that someone is selling a “spiral bound version” – I have no idea what that is, I don’t think it’s WOF, and it’s certainly not me. We are looking into it. Short version: Don’t buy that.