In the past God spoke to our ancestors through the prophets at many times and in various ways, but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom also he made the universe. The Son is the radiance of God's glory and the exact representation of his being, sustaining all things by his powerful word. After he had provided purification for sins, he sat down at the right hand of the Majesty in heaven. Hebrews 1:1-3
A great teacher uses different methods to drive home the point. That's what God did in the Old Testament. He put forth His message in a variety of ways. Sometimes He used visions, dreams, and supernatural interventions. Other times He wrote the Law on tablets of stone and delivered it to the people through His servant Moses. Then there were times when God spoke through the prophets, sending warning and encouragement. While the delivery systems varied, the point was clear: God desired to speak to man. In the New Testament, the Word became flesh.
Jesus became the human mouthpiece of God. He clearly revealed the person of God and vividly explained the promises of God. Jesus not only explained how a person could know God; He made that relationship possible by His voluntary, sacrificial death on the cross. Then Jesus was raised to life to show God's power over death itself. Now He has "sat down at the right hand of the Majesty in heaven."
Think of it this way. The Old Testament believers held a package. It was wrapped with the law and sacrificial system. They knew the Gift was inside and they placed their faith in the promised Gift. On this side of the cross, the Gift is unwrapped and the Person of Jesus is revealed. We see Jesus--the "radiance of God's glory and the exact representation of his being." And every day we thank God for the work of His Son!
Dear Father, thank You for revealing Yourself in Jesus. Lord Jesus, thank You for coming to earth and loving us all the way to the cross. May we respond with a life of thanksgiving and worship. In Jesus' name. Amen.