When God appeared and spoke from the top of Mount Sinai, delivering his commandments, the Israelites were filled with terror: “Now when the people saw the thunder and the flashes of lightning and the sound of the trumpet and the mountain smoking, the people were afraid and trembled, and they stood far off and said to Moses, ‘You speak to us; and we will listen; but do not let God speak to us, lest we die…. The people stood far off, while Moses drew near to the thick darkness where God was” (Exodus 19:18-19, 21). It was not something that they choreographed, manufactured, produced, or packaged. God simply showed up on the scene and started speaking. They were clearly not in control of the situation and they did not like the experience at all. However, it id create in them an urgent need that they did not feel before, namely, the need for a mediator.
Horton, Michael; The Gospel Driven Life: Being Good News People in a Bad News World; Baker Books; Grand Rapids, MI; Copyright 2009; page 221-222