The key to interpreting Scripture is doing so within the context of the entirety of Scripture.
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Campion is correct. Listen to what Pope, Charles says, because it is what Jesus said: The entirety of the Scriptures testifies to Him.
LUK24:25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: LUK24:26 Ought not Christ to have suffered these things, and to enter into his glory? LUK24:27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.
God. KING JAMES BIBLE TOUCH - KJV (Kindle Locations 41423-41426). Kindle Edition.
On this I agree. Everything we need regarding on how to have salvation is in the Scriptures. They are the only inspired texts we have.
And Scriptures were given to us so we could come to understand this. Only Scripture gives us the truth.