Perhaps when most people think of God speaking, they have in mind a kind of Monty Python booming voice from the clouds, a message that is inescapably and undoubtedly divine. Yet the evidence of Christian history and the testimony of numerous Christians throughout the world and previous centuries suggest that that kind of communication is vanishingly rare. God usually delivers his message through more ordinary methods – so ordinary that it is very easy to miss it. In fact, the most definitive time God spoke to the human race, it wasn't in a booming voice from the skies, but in the words of a scruffy looking Jewish rabbi who looked as human as the rest of us.
Despite the mediaeval imagery, Jesus did not walk around with a golden halo around his head that served as a sign saying, ‘this is the Son of God!’ It was quite possible to meet Jesus, listen to him speak, even shake his hand, and entirely miss the fact that you were speaking to God.
As the early Christians thought through their Christology, in other words their understanding of how God and humanity came together in the person of Jesus, the main conclusion was that Christ’s divine nature did its work through, rather than apart from his human nature. It is not that some of his actions and words were divine (for example miracles, inspired teaching etc.) and some human (eating, sleeping and asking for directions) but rather that both human and divine natures were involved in all that he did - the human nature passively allowing itself to be the vehicle through which God did his work. So that when you met Jesus you could see God working perfectly through a human being in the way that we were always meant to.
For those who had the eyes to see it and the ears to hear it, although he looked and spoke just like an ordinary human, Jesus was far more than that - he was the one through which God definitively spoke to the human race.
All that suggests a very different way of God speaking to us. God normally speaks to us through ordinary human interaction and through commonplace events that might happen to everyone.