I'd agree with you, even though the bible doesn't specifically say that...
This verse is the most over-used verse of Scripture that I have ever seen that doesn't prove anything that Protestants want it to...
I think the point protestants try to make is that they check things out in scripture. The New Testament as well. :-) I don't see many Catholics blowing the dust of the Bible checking to see if something the Pope said jives with the writings.