Psalm 43:4 Then I will go to the altar of God, to God my exceeding joy; and on the harp I will praise You, O God, my God.
When we are able to know in our hearts that Christ is willing and able to forgive us, we are able to come to God and worship Him with open hearts and with true joy!
Have you ever tried to be happy at a party when you have just had terrible news? It is very hard to set aside the sadness.
The same can be said about sin in our lives. If we are not able to set it aside we shall not be able to come to any celebration with God and praise Him as we should.
Lay aside sin and be glad in Christ!