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1 This poem furnishes two hymns to the Roman Breviary, one to be sung on Wednesday at Lauds, and consisting of ll. 1-8, 48-53 (omitting l. 50), 57, 59, 60, 67 (tu vera lux caelestium) and 68: the other for Thursday at Lauds, consisting of ll. 25 (lux ecce surgit aurea), 93-108.
17 Cf. Ambrose, ii. 8, de Cain et Abel: "The thief shuns the