Mountains turn up all the time in the Bible. They can be places where God interacts with people, such as Mount Sinai where God gave the commandments to Moses to take back down to Israel, or where someone with “clean hands and a pure heart” can meet with Him, or where a chosen few disciples can see the transfiguration of Jesus. Or people can shout for joy from the mountaintops. And a mountain can also be simply a place from which to speak, with the most famous example being that of the Sermon on the Mount: “Now when Jesus saw the crowds, he went up on a mountainside and sat down. His disciples came to him, and he began to teach them.” (Matthew 5:1-2 NIV) Here’s this big crowd, and here’s a high place to sit which happens to be on a mountainside, so Jesus uses it.