determining truth

Greetings all! I have been speaking with my brother about his wavering faith for a while and he's been really "distraught and tired" about thinking about all these things. He's talked with his own pastor but has since left the church. A bit of background about him: confessed faith in Christ...

For a little bit of context: I had a recent conversation with a Catholic friend. We came to the discussion of the canonical books of the Bible. I attempted to explain how it's not the Church that approves the books of the Bible, but rather, it is the Holy Spirit that testifies to us Christians...