Concerns About Orthodoxy

Quote from Letter 4,37 to Constantius, bishop of Milan. July 594.

Having run through the letter of your Holiness, we know that you are seriously upset, most of all because of the bishops ad citizens of Brescia. For they command you to send a letter to them, in which you must swear that you have not condemned the Three Chapters at all. If the predecessor of your Fraternity, Laurence, did not do so, you should not be asked to write. But if he did so, he was outside the universal Church, and overstepped the oaths of his pledge.
However, we believe that the same man kept his oath and remained in union with the Catholic Church. Thus there is no doubt that he dod not swear to any of his bishops that he had not condemned the Three Chapters at all. From this, let your Sanctity conclude that you should not be forced to do what your predecessor certainly did not do. But, so that those who wrote those words to you should not be offended, send them a letter, and in it declare this under the interposition of anathema, that you neither take away anything from the faith of the synod of Chalcedon nor receive those who do so, and that you condemn whomsoever it condemned, and absolve whomsoever is absolved.

Cited from: The Letters of Gregory the Great, trans. John R.C. Martyn (Toronto: PIMS, 2004), I:317