O God, Who didst vouchsafe unto blessed Irenaeus, Thy martyr and bishop; by his strenuous teaching of the truth, utterly to confute heresies, and happily to establish peace in Thy Church: unto us Thy people, grant, we beseech Thee, to be steadfast in the practice of our holy religion, and in all our days to enjoy that peace which is from Thee. Through our Lord.