In Evil and the Cross, Henri Blocher writes about the tension that exists for the Christian regarding the existence of evil:
The evil of evil, the lordship of the Lord, the goodness of God: these three immovable propositions stand together as the basis of biblical doctrine. We can picture them as a capital T: the sovereignty of God forms the stem, the two branches being the denunciation of evil and the praise of God in his goodness. But the great difficulty lies in holding all three together (100).
Blocher then considers the cross of Jesus Christ:
In the light of the cross, how could there be any doubt about the three propositions at the heart of the Christian position?
The sheer and utter evilness of evil is demonstrated there: as hatred in the mockery of the criminals who also hung there; as hateful in the weight of guilt which could be removed only by the sacrifice of the Lamb of God . . .
The complete sovereignty of God is demonstrated there: all this happened ‘by God’s set purpose and foreknowledge’ (Acts 2:23), for it was necessary that the Scriptures be fulfilled, those which bore witness to the destiny that the Lord had assigned to his Servant . . .
The unadulterated goodness of God is demonstrated there. At the cross, who would dare entertain the blasphemy of imagining that God would, even to the slightest degree, comply with evil? It brought him death, in the person of his Son. Holiness stands revealed. Love stands revealed, a pure love; there is no love greater. Because of the cross we shall praise his goodness, the goodness of his justice, the goodness of his grace, through all eternity (104, paragraphing mine).