Hebrews 1:8 (ESV) But of the Son (Jesus) God says, “Your throne, O God, is forever and ever.” 
Notice God just called Jesus, God. God says to the Son, Jesus, “Your throne, O God, is forever!” The Son is not simply the representative of God; he is God. This is a direct quote from Psalm 45:6.
Psalm 45:6 (ESV) Your throne, O God, is forever and ever.
This Psalm is praising a King and then identifying him as the Jewish Messiah which the NT later identifies as Jesus.