I always think of what to say about 2 hours too late...
I was briefly discussing sola Scriptura ("Scripture alone") with a mate and mentioned (among other verses) 1 Corinthians 4: "Do not go beyond what is written."
He said "Apparently that was a common saying of the Pharisees in their day."
My response at the time was "I didn't know that." Which had the one saving grace of being true.
Two hours later, with brilliant (retrospective) timing, I delivered my wry riposte into the echoing chambers of my mind: "Wait... How do we know that?"
Because, if you accept such an interpretive context, you either say:
'Don't go beyond what is written' is best understood by going beyond what is written.
Or - if you're really committed to the cause - you'll say:
"Ha! Even extra-biblical sources support sola Scriptura!"
I really like the latter. It's a defence of irrefutable illogicality and impregnable stupidity.
Just my style.