[All]: The plea for divine light to dispel the soul’s darkness is a Psalmic motif (e.g. XVII.29 Deus meus, illumina tenebras meas ‘O my God, enlighten my darkness’) occurring also in liturgical hymns: e.g. Ambrose’s Aufer tenebras mentium ‘remove the darkness of our minds’ and Tu lux, refulge sensibus ‘You light, shine upon our senses’ (AH 51, 28 and 50, 10 respectively; cf. Brev. Nidr., fer iii ad mat., c.vi and off. dieb. ad laud., a.viii).