"The mere forgiveness of God would not affect us in our alienation from God. ..."

 ... Man must be represented in the making of the new treaty of peace, the "new and eternal covenant". He is represented because we have been taken over by the man Jesus Christ. When he "signs" this treaty in advance in the name of all of us, it suffices if we add our name under his now or, at the latest, when we die.

Of course, it would be meaningless to speak of the Cross without considering the other side, the Resurrection of the Crucified. "If Christ has not risen, then our preaching is nothing and also your faith is nothing; you are still in your sins and also those who have fallen asleep . . . are lost. If we are merely people who have put their whole hope in Christ in this life, then we are the most pitiful of all men" (I Cor 15:14, 17-19). 

If one does away with the fact of the Resurrection, one also does away with the Cross, for both stand and fall together, and one would then have to find a new center for the whole message of the gospel. What would come to occupy this center is at best a mild father-god who is not affected by the terrible injustice in the world, or man in his morality and hope who must take care of his own redemption: "atheism in Christianity".

— from A Short Primer For Unsettled Laymen by Fr. Hans Urs von Balthasar. Read more here: