God shows you the Bible is His word without error. He doesn’t have to prove it to you. He tells you. His Word to you is proof.

(Quote from https://realreality.org/downloads/how-god-will-transform-you/)

You don’t have to presuppose God’s revelation or figure it out.

God intends to transform you and make you like Jesus. You can’t even imagine what that is right now, but your transfiguration will make human ideas about power and authority look foolish. It will make human ideas about love, justice, and peace look pathetic. This is transformation beyond your wildest hopes. You’ve always sensed an inner longing for something more. God put that longing in your heart, and He intends to fulfill it in you. You now know how to seek God and find Him. You know how to let the Holy Spirit lead you. You know how to receive the powerful and effective faith of God. Those are the first two keys you need to open God’s mysterious and ingenious lock. Those two keys alone won’t open the door to your total transfiguration into the image and likeness of Christ. Three more keys remain. I’ve hinted at them, but you need the detail to see how they work. And you have much to learn about the pitfalls and traps Satan has set for you. You need to know how to avoid all those pitfalls and traps.  You need to know how to apply the remaining three keys in God’s way and order.