Funny how Jesus can stand on a hill some 547 feet above sea level and can be heard for a mile away but I can read His bible and pray and not hear one word from him. The reason is not that God is hard to hear but that my mind is cluttered with so many distractions that it is impossible to hear anything.
The Sermon on the Mount is a favorite, it details upside down living...meaning, his commands in the Sermon on the Mount calls us to live completely opposite of how we either want to or the world calls us to.
Listening to the sermon was a great teaching tool.