The context of Paul’s reference to “scripture” (3:16) in his 2nd letter to Timothy is v. 15, which refers to Holy Scripture and not other secular writings from which an excerpt might be taken.
Well, I generally agree. But at that time it would have meant the Septuagint, which contains quite a few books we consider not to be canon.
On a related note, you know where Paul talks about the length of a man’s and a woman’s hair and “nature”? It never really made sense to me no matter how you slice it, until I applied cultural and contemporaneous context.
Then this popped up and it is fully explained:
Paul was a well read man, and Hippocrates was his contemporary. And here is Hippocrates on that exact subject:
Note, there are a lot of sites that discuss this. Just google “hippocrates hair as sex organ” without quotes and you’ll see what I mean.
There is a lot more going on in our bibles than we fully understand.