Explanation of Leo XIV's Coat of Arms
The blue background of the left field recalls the heights of the heavens and is characterised by its Marian significance — a classic symbol referring to the Blessed Virgin Mary, the lily or fleur-de-lis (flos florum).
The other field is white and features the emblem of the Augustinian Order: a flaming heart pierced by an arrow. This image symbolises the words of Saint Augustine in the Confessions: 'Sagittaveras tu cor meum charitate tua' ('You have wounded my heart with your love').
The book also commemorates the enlightened works that the Doctor of Grace bestowed upon the Church and humanity.
Ivory, a shade of white, is a recurring colour in the coats of arms of other religious orders and can be read as a symbol of holiness and purity.
The motto, 'In Illo Uno Unum' ('In the one Christ we are one'), recalls the words of Saint Augustine in a sermon on Psalm 128, in which he explains that 'in the one Christ we are one', 'one in the one Christ'.
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