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For one thing, it would be very hard to even make a sound case for the Christian worldview without viewing Scripture as a revealed whole, in light of the doctrines of inspiration, providence, prophecy, etc. There is basically no logical or systematic way to arrive at a position of Jesus' words being the only inspired writing; and that is the position your friend would need to take in order to consistently affirm that they are the only Scriptures worth reading, because of 2 Timothy 3:16.
Also, I would ask him what he makes of the fact that Jesus cited the Old Testament so many times in an authoritative way. Similarly, has he ever read the red letters of John 16:13, where Jesus says the Spirit will guide the disciples into all truth? That of course has massive implications for the necessity, authority and benefit of the other "black-lettered" New Testament Scriptures.
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