God’s holiness was also manifest at the cross. Habakkuk wrote that God is “of purer eyes than to see evil and cannot look at wrong” (Habakkuk 1.13). Never did God so manifest His hatred for sin as in the suffering and death of His own Son. As Christ suffered on the cross, bearing the sins of the world, God turned away from His [one and] only Son. That’s why Jesus cried out in agony, “‘Eli, Eli, lema sabachthani?,’ that is, “My God, my God, why have You forsaken Me?'” (Matthew 27.46). Even though the Father loved Jesus Christ with an infinite love, His holiness could not tolerate looking with favor on the One who bore the sin of the world. All the cheerful obedience of godly people from every era is nothing compared to the offering of Christ Himself to satisfy every demand of God’s holiness. Through that offering, God was glorified.
God’s faithfulness also was displayed at the cross. He had promised the world a Savior from the beginning. When Christ, the sinless One, was offered on the cross to receive the full and final wages of sin, God showed to all heaven and earth that He was faithful. Even though it cost Him His only Son, He went through with it. When we see that kind of faithfulness, we are seeing His glory.
From: The Upper Room: Jesus’ Parting Promises for Troubled Hearts by John MacArthur; 2nd edition (n.p.: Kress Biblical Resources, 2014), p. 51.