Read Psalms 103:17  Do you remember mercy and grace?  God's grace is giving us something that we don't deserve.  What is God's mercy?  God's mercy is God not giving us the punishment that we do deserve!  One of the greatest things about God is that He is eternal.  Our verse says that God's mercy, His forgiveness, is eternal; it is from everlasting to everlasting.  Imagine you are standing on top of a huge mountain.  You look as far as you can see in one direction.  Then you turn around and look backwards in the opposite direction as far as you can see.  That is a picture of God's mercy to us!  Our verse says that God's mercy is from everlasting - as far as we can see in one direction, to everlasting - as far as we can see in the opposite direction!  But God can see really, really far in each direction!  That is how great His mercy, His forgiveness, is to us!  Let's stop and thank God for His forgiveness!