Perhaps you should read what I wrote. Then read the Summary Rule and Norm in the Epitome
_1] 1. We believe, teach, and confess that the sole rule and standard according to which all dogmas together with [all] teachers should be estimated and judged are the prophetic and apostolic Scriptures of the Old and of the New Testament alone, as it is written Ps. 119:105: Thy Word is a lamp unto my feet and a light unto my path. And St. Paul: Though an angel from heaven preach any other gospel unto you, let him be accursed, Gal. 1:8.
2] Other writings, however, of ancient or modern teachers, whatever name they bear, must not be regarded as equal to the Holy Scriptures, but all of them together be subjected to them, and should not be received otherwise or further than as witnesses, [which are to show] in what manner after the time of the apostles, and at what places, this [pure] doctrine of the prophets and apostles was preserved.
3] 2. And because directly after the times of the apostles, and even while they were still living, false teachers and heretics arose, and symbols, i. e., brief, succinct [categorical] confessions, were composed against them in the early Church, which were regarded as the unanimous, universal Christian faith and confession of the orthodox and true Church, namely, the Apostles’ Creed, the Nicene Creed, and the Athanasian Creed, we pledge ourselves to them, and hereby reject all heresies and dogmas which, contrary to them, have been introduced into the Church of God._
, then read the Apology about the real presence, then this:
_Who, but the devil, has granted such license of wresting the words of the holy Scripture? Who ever read in the Scriptures, that my body is the same as the sign of my body? or, that is is the same as it signifies? What language in the world ever spoke so? It is only then the devil, that imposes upon us by these fanatical men. Not one of the Fathers of the Church, though so numerous, ever spoke as the Sacramentarians: not one of them ever said, It is only bread and wine; or, the body and blood of Christ is not there present.
Surely, it is not credible, nor possible, since they often speak, and repeat their sentiments, that they should never (if they thought so) not so much as once, say, or let slip these words: It is bread only; or the body of Christ is not there, especially it being of great importance, that men should not be deceived. Certainly, in so many Fathers, and in so many writings, the negative might at least be found in one of them, had they thought the body and blood of Christ were not really present: but they are all of them unanimous.”_
Doctrine comes from scripture. Tradition supports it.