Here is the closing prayer for the extraordinary form Roman liturgy during this week of the 15th Sunday after Pentecost, from which I draw the above ejaculation for the Lord's cleansing and protection of Holy Mother Church.
Ecclésiam tuam, Dómine, miserátio continuáta mundet et múniat: et quia sine te non potest salva consístere; tuo semper múnere gubernétur.
Per Dóminum nostrum Iesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti Deus, per ómnia sǽcula sæculórum.
O Lord, we beseech thee, let thy continual pity cleanse and defend thy Church, and because it cannot continue in safety without thy succour, preserve it evermore by thy help and goodness.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, ever one God, world without end.
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