The crucifixion, which ended with the triumphant cry, “It is finished” (Jn 19.30), was the offering of the all-sufficient sacrifice for the atonement of all sinners. The Man on the cross was the Lamb of God, who bears the sins of the world to carry them away from the face of God. The salvation of the whole world once hung by those three nails on the cross on Golgotha. As the fruit from the wood of the forbidden tree from which the first man once ate brought sin, death, and damnation upon the entire human race, so the fruits of the wood of the cross restored righteousness, life, and blessedness to all people.
On account of this, the cross is both holy and blessed! Once nothing but a dry piece of wood, it was changed, like Aaron’s staff, into a green branch full of heavenly blossoms and fruit. Once an instrument of torment for the punishment of sinners, it now shines in heavenly splendor for all sinners as a sign of grace. Once the wood of the curse, it has now become, after the Promised Blessing for all people offered Himself up on it, a tree of blessing, an altar of sacrifice for the atonement, and a sweet-smelling aroma to God. Today, the cross is still a terror–but only to hell. It shines upon its ruins as a sign of the victory over sin, death, and Satan. With a crushed head, the serpent of temptation lies at the foot of the cross. It is a picture of eternal comfort upon which the dimming eye of the dying longingly looks, the last anchor of his hope and the only light that shines in the darkness of death.
— C.F.W. Walther (quoted in Treasury of Daily Prayer, p. 622)