The problem is for that first 300 years, there was no Bible. There was a Church. There was no Bible.
Now, there WAS the Hebrew scriptures. There were also various writings related to Jesus Christ - some of these were ultimately accepted as canonical. Some were not.
So a believer in 200 AD could not have possibly had recourse to "recall from Scripture".
That's a real problem for the sola scriptura believer. I have seen it danced around, but never answered.
Yeshua proved Himself perfectly from the Old Testament, and His disciples likewise. If you cannot, then maybe you are reading it wrong. ; )