This is it using the Farnborough Diurnal translation:
Grant unto Thy faithful people pardon and peace, we beseech Thee, merciful Lord, that they may be both cleansed from all their sins and serve Thee with a quiet mind. Through our Lord.And in the Latin:
Largire, quaesumus, Domine, fidelibus tuis indulgentiam placatus et pacem: ut pariter ab omnibus mundentur offensis, et secura tibi mente deserviant. Per Dominum nostrum.
There can be no greater blessing than having a quiet mind with which to serve God. And right now, of all times, I really do not deserve this greatest of gifts...