« SUMMAE DEUS CLEMENTIAE ». – Hymn of Lauds for the feast of the Seven Sorrows of Mary Most Holy on 15 September, by an unknown author.
The author addresses the Eternal Father, asking Him to grant men the ability to meditate on the wounds of Jesus and the sorrows of the Virgin, whose tears helped to cleanse the world of all sins.
BIBL.: C. Albin, La poésie du Brév., Lyon n.d., p. 334; A. Mirra, Gli inni del Brev. rom., Naples 1947, p. 176.