What is the significance of God having spoken through Jesus Christ “in these last days”?

Almost everyone understands that our world is in the midst of an authority crisis. Two related questions keep being asked. Who can I believe? Who should I obey?

These questions are not so different from the questions the writer of Hebrews is seeking to answer. In the early New Testament era there were many voices seeking to be heard, both within Judaism and in paganism. The writer of Hebrews seeks to show that, among all the voices clamoring for attention, Jesus is the only truly authoritative voice. As a teacher you might want to start today's lesson making a list of all the voices in our day clamoring for attention: psychics, new agers, politicians, economists, entertainers might be a good start. What evidence can a Christian give to the world that Jesus should be believed over any of these voices?