Psalm 45:6 Your throne, O God, is forever and ever;
A scepter of righteousness is the scepter of Your kingdom.
This Psalm points to Jesus as the eternal, righteous King. In order to reign with Jesus eternally we need to be righteous as well. The problem is that we were born sinners and not righteous. In order to solve this problem Jesus paid for our sins on the cross. He was crucified. When we believe in Him, He takes our sin on Himself and nails it to the cross. He then fills us with His righteousness. 2 Corinthians 5:21 says, “For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.” When we believe in Jesus our sins are forgiven and we can live with Him forever eternally.