“And a voice came out of the cloud, saying, ‘This is my Son, my Chosen One; listen to him!’” (Luke 9:35, ESV)
In His ministry, Jesus went about performing many mighty miracles as well as casting out demons. These mighty works were proof of His divine status, proof that He was the Messiah and that He had power over sin and Satan. The Transfiguration confirmed that, though this event was only witnessed by three of His apostles. These three men, though they witnessed such a glorious sight, were still uncertain of His real status. They though He was equal to Moses and Elijah.The voice from heaven confirmed that, as great as Moses and Elijah were, Jesus was infinitely greater: He is the Son of God and equal in every way to His Father.
That voice also tells us that what we believe about Jesus is vital to our eternal salvation. What people believe about Jesus is what divides humanity. Jesus Himself indicates here that there is no way to serve Him halfway. Those who say they believe in Him must believe that He is Lord God and Savior. Those who reject Him as God and/or Savior really cannot call themselves Christians because Jesus revealed Himself as such. Neither can they who say He was just a good man or a good philosopher with ideas and thoughts that are on a par with other thinkers and philosophers such as Aristotle, Kant, Hawking or Einstein. Jesus has revealed Himself as God. And so if we accept the revelation of Christ then we must follow Him and walk in obedience to what he has commanded us to do. There are no compromises or other options.