<P> The Collect for Purity is the name traditionally given to the collect prayed near the beginning of the Eucharist in most Anglican rites . It appears in Latin in the 11th - century Leofric missal and was part of the preparation prayers of priests before Mass . Thomas Cranmer translated the prayer into English and from there it has entered almost every Anglican prayer book in the world . </P> <P> In the Leofric missal and the later Sarum Rite, the original Latin prayer occurs as one of the prayers said before Mass: </P> <Dl> <Dd> Deus cui omne cor patet et omnis voluntas loquitur: et quem nullum latet secretum: purifica per infusionem sancti spiritus cogitationes cordis nostri: ut te perfecte diligere et digne laudare mereamur, per dominum nostrum iesum christum filium tuum qui tecum vivit et regnat in unitate eiusdem spiritus sancti deus, per omnia secula seculorum . Amen . </Dd> </Dl> <Dd> Deus cui omne cor patet et omnis voluntas loquitur: et quem nullum latet secretum: purifica per infusionem sancti spiritus cogitationes cordis nostri: ut te perfecte diligere et digne laudare mereamur, per dominum nostrum iesum christum filium tuum qui tecum vivit et regnat in unitate eiusdem spiritus sancti deus, per omnia secula seculorum . Amen . </Dd>

Cleanse the thoughts of our hearts by the inspiration