teachers are not perfect.
the bereans searched the scritpures daily looking for answers to questions.they were not told to stop or condemned for doing so.
the average christian is told to test all things by scripture. you say they may get things wrong, or ignore a truth they don’t like. i say anyone can, including teachers and church leaders.
It is made to the Eleven, not to all the followers of IHS. BY the end of Acts 3 the "Eleven plus one," are the apostles to whose teaching (and fellowship) "they" are devoted.
It is clear from Acts (and Galatians) that, even if we Catholics insist that Peter was the first chief apostle, we can't possibly maintain that his day-to-day teaching and example were perfect.
Yet this imperfect and seemingly contentious group did meet to produce authoritative teaching.
IF we can rest in saying, "Teachers are not perfect," and in leaving it there, then I don't see how we have anything to say to the various groups which persist to this day and which make what certainly SEEM to be "Judaizing" assertions about how we ought to live.
I don't see how in that case any one group has anything to say to any other. "Teachers are not perfect. We think YOUR teachers are imperfect on this matter. YOU think OUR teachers are. Have a nice day." What else can be said? And what then of a guidance of the Holy Spirit?
And finally, that seems to come down, "Not all are teachers," but they might as well be, since any one of them may be imperfect -- so even if you're not a teacher you must be teacher to yourself.
THis is clearly not a conclusive argument -- or meant to be one. But it seems to me the problem of "sola Scriptura" and of what seems to be its necessary consequence, a Church whose bounds on earth are not clear.