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 1:3
Hebrews 1:3 puts it so simply. Jesus was and is the radiance of God's glory. He represented God in everything that He is. A picture a child would draw of the Sun is the best illustration I can think of. The main circle being God, and the rays being Christ radiating who God is in all His glory. Just imagine the rays going on for eternity!
Glory to God in the highest, And on earth peace, goodwill toward men! Luke 2:14
Holy, holy, holy is the LORD of hosts; The whole earth is full of His glory! Isaiah 6:3
How GREAT would it be if our lives were the rays of God's glory. If we were so covered in God's glory that it was radiant on our faces and in our lives. That we represented who He was. There can be no higher goal in life than to bring glory to the King of Kings and the Lord of Lords. Give Him glory!