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The apostles, including Peter and Paul, definitely did not consider their letters to be scripture.
The three words “the rest of” were obviously added long after the apostles were dead. They considered Tanakh to be the scriptures.
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Golly; then what DID they consider them to be??
Colossians 4:16 After this letter has been read to you, see that it is also read in the church of the Laodiceans and that you in turn read the letter from Laodicea and that you in turn read the letter from Laodicea. 1 Thessalonians 5:27 I charge you before the Lord to have this letter read to all the brothers and sisters.
They WERE??
What proof do you offer to prove this assertion?
Your claim sounds a bit like Eve's 'knowledge' found in Genesis 3:2
You must not eat fruit from the tree that is in the middle of the garden, and you must not touch it, or you will die.
You must not eat fruit from the tree that is in the middle of the garden, and you must not touch it, or you will die.
The apostles, including Peter and Paul, definitely did not consider their letters to be scripture.