Arthur,
That is a (sadly common) false argument you just put forth.
I’m surprised that this wasn’t covered in your seminary courses.
I will Help.
.............snip..............
REPLY: We are offered an argument of the following form:
(1) Sola Scriptura = All true propositions are stated in Holy Scripture.
(2) Sola Scriptura is not stated in Holy Scripture.
(3) Therefore, Sola Scriptura is not a true proposition.
But in fact, the argument should be of the form:
(1) Sola Scriptura = All truths necessary to salvation are stated in Holy Scripture.
(2) Sola Scriptura is not stated in Holy Scripture.
(3) Therefore, Sola Scriptura is not a truth necessary to salvation.
http://www.angelfire.com/ny4/djw/lutherantheology.kiefersolascriptura.html
Best
Is SS not a truth necessary to salvation?