I think you need to disabuse yourself of the paradigm that the Word of God, as Catholics see it, is ONLY Scripture.
I know Catholics believe the word of God is spoken through
the Scripture, the Sacred Tradition, and the living teaching office called the Magisterium. I learned and struggled with them daily as a Roman Catholic, so the very words are more familiar to me than the air I breathe.
We proclaim that the Word of God is Jesus Christ Himself, and that he was revealed his Word through 2 channels: Scripture and Tradition.
The Word is the Logos. We are called Logikoi, the âWord-likeâ, for we are in His image. Not only that, but we are the âlogic-likeâ, the âreason-likeâ, for God is indeed truth itself and wisdom itself, in Whom we have these qualities by reception. The scriptures speak of Godâs words in two ways: His written law, and His spoken word that creates and upholds all things. âHe spoke, and the waters brought forth creatures, etc.â. I simply donât see a warrant for believing that
infallible human oral tradition is one of the channels.
Of course you may well argue that the events described in the Bible occurred long before they were written; for example the prophet Ahijah in the books of Kings brought the word of the Lord by mouth long before this was written down in those books. I have no answer for you naturally, since I am not long out of Rome and am still learning.
Thus, you can see that âthy word is a lampâ can (and does!) refer to Scripture AND Tradition.
In the context of Psalm 119, the psalmist is speaking about the written law. He calls it Godâs word, Godâs testimony, Godâs law, Godâs commandments, and many other things. The Law is something specific - not the traditions of the Talmud, but the written word of the Torah. I think the context suggests written tradition alone.
That paradigm of âonlyâ or âaloneâ, Aefensang, is the beginning of almost all heresies proclaimed through the entirety of Christian history.
That is an interesting assertion. Gnostics did say Jesus was only spiritual. Arians did say Jesus was only a man. Just because the word âonlyâ is the beginning of most heresies, however, doesnât mean itâs the beginning of all heresies, as you point out.
Catholicism is the best of ALL because it proclaims:
Not Faith ONLY. But faith AND reason.
Classical Protestantism too.
Not Faith ONLY. But faith AND works.
Our sincere faith and contrite heart pleases God, as Psalm 49 (50) says. Our works in faith save us, as the Lord Jesus said. No conflict.
Not Jesus as Man ONLY. But sharing divine AND human natures.
Of course, here your argument does not hold together 100% of the time: the Lord Jesus is
only a divine person, with a human nature assumed at the holy Incarnation. Since you say that
âonlyâ formulae mostly lead to heresy, should you conclude that Jesus is not only a divine person but a human person too? Clearly not, as Rome herself denies that.
ThusâŚ
Not Scripture ONLY. But both Scripture AND Tradition.
⌠this is not necessarily a truism. Iâve heard a Catholic say, once, that since Jesus is human and divine, it only makes sense that we follow both tradition and scripture - itâs most fitting, most mystical, most in keeping with Godâs economy of salvation, etc. I might just as well say that we only need divine scripture because Jesus is only a divine person.

Sometimes the semantics go on in circles.
Sometimes it is the ONLY mentality that causes blinders to develop.
(NB: But the point remains: creating ONLYs where none are required is a stumbling block that need not exist.)
Your nota bene is considered. I just want to highlight this part: who says the âONLYsâ of Catholicism are not also superfluous? Classical Protestants donât even follow that whole paradigm in all things. Indeed, âonly Scripture contains saving truthâ, but Scripture AND tradition teach us some very holy ideals of worship. Scripture AND tradition give us godly norms of living, etc., but only Scripture teaches us the highest things of God
without error.

Thatâs our contention.
I donât believe any Catholic here has said anything to the contrary?
Indeed not, I was just emphasising the simplicity of this subject. We can blow it up into issues about Mary, purgatory, justification, invocation, prayer for the dead, and a million things, but in the end it is simple. The big contrast between Rome and Protestantism is that the former believes Scripture* and the traditions of a certain group of men* are 100% trustworthy in matters of our salvation, whereas the latter believes only Scripture is 100% trustworthy in these matters.