Pope Gregory XIII, Profession of Faith Prescribed for the Greeks, 1575: “I, N., in firm faith believe and profess each and every thing which is contained in the Creed of faith, which the holy Roman Church uses, namely: I believe in one God [as in the Nicean-Constantinopolitan Creed, n. 86, 994].

I also believe, and I accept and profess all the things which the holy ecumenical Synod of FLORENCE defined and declared concerning the union of the western and eastern Church, namely that the Holy Spirit is eternally from the Father and the Son; and that He has His essence and His subsistent being from the Father and from the Son together; and that He proceeds from both eternally, as from one principle and by a single procession, since what the holy Doctors and Fathers say comes to mean the same thing, that from the Father through the Son the Holy Spirit proceeds, and that the Son, according to the Greeks, is also the cause, and according to the Latins, indeed the principle of the subsistence of the Holy Spirit, as is the Father...

Besides, I profess and accept all the other things which the holy Roman and Apostolic Church, according to the decrees of the holy ecumenical general Synod of TRENT, proposed and prescribed should be professed and accepted, as well as the contents in the above mentioned creeds of faith, as follows: Apostolic . . . and all the rest, as in the profession of faith of TRENT”