The Catalog of Testimonies (an appendix to the 1580 Book of Concord) deserves to be better read and studied by evangelical-catholics, if for no other reason, than to marvel at how familiar 16th century theologians were with the early Church Fathers. Why did they create the Catalog? "Therefore they are printed in goodly number as an appendix at the end of this book, in regard to particular points, for the purpose of furnishing a correct and thorough account to the Christan reader, whereby he may perceive and readily discover that in the aforesaid book nothing new has been introduced either in rebus (matter) or in phrasibus (expressions), that is, neither as regards the doctrine nor the manner of teaching it, but that we have taught and spoken concerning this mystery just as, first of all, the Holy Scriptures and afterwards the ancient pure Church have done."
Just one small example, quoting the Council of Chalcedon:
"Following, then, the holy fathers, we confess one and the same Son, our Lord Jesus Christ, and we all set forth with one voice that the same is perfect in deity and the same perfect in humanity; that the same is truly God and truly man, consisting of a rational soul and a body; that He is consubstantial with the Father as regards the deity, and that the same is consubstantial with us according to the humanity; that He is in all respects like us, excepting sin; that He was begotten before the world out of the Father according to the deity, but that the same person was in the last days born for us and for our salvation of Mary, the virgin and mother of God, according to the humanity."