Many have affirmed that the cross was indeed the definitive revelation of the glory of God. Here are a few noteworthy quotes in this regard.
John Calvin said: “In the cross of Christ, as in a splendid theatre, the incomparable goodness of God is set before the whole world. The glory of God shines, indeed, in all creatures on high and below, but never more brightly than in the cross…in that death we see a boundless glory” (emphasis mine).
Craig Koester said: “The glory of God was revealed most fully in the suffering and death of Jesus Christ” (emphasis mine).
C.H. Dodd said: “If the actions of Christ are to be taken as equivalents for the radiance in which the power and presence are brought within human experience, or in other words, in which the eternal light is apprehended by means of itself, φωτὶ φῶς, then the action in which he most fully expressed himself, namely his self-devotion to death in love for mankind is the conclusive manifestation of the divine glory…thus if in the incarnate life of Christ the eternal, archetypal light is manifested, its final manifestation, is in his death” (emphases mine).
Jurgen Moltmann said: “When the crucified Jesus is called the ‘image of the invisible God,’ the meaning is that this is God and God is like this. God is not greater than he is in this humiliation. God is not more glorious than he is in this self-surrender. God is not more powerful than he is in this helplessness. God is not more divine than he is in his humanity. The nucleus of everything that Christian theology says about God is to be found in this Christ event” (emphasis mine on last phrase).
D.A. Carson said: “The supreme moment of divine self-disclosure, the greatest moment of displayed glory, was in the shame of the cross” (emphasis mine).
Samuel Zwemer said: “If the cross of Christ is anything to the mind, it is surely everything—the most profound reality and sublimest mystery. One comes to realize that literally all the wealth and glory of the gospel centres here. The cross is the pivot as well as the centre of New Testament thought…the glory of the cross is as real as its shame; and to meditate on the shame is to see the glory…its (the cross) shadow is the longest shadow in the world…the cross is the center of the universe and of history” (emphasis mine).
 Craig Koester, Symbolism in the Fourth Gospel: Meaning, Mystery, Community (Minneapolis: Fortress Press, 1995), 185.
 C.H. Dodd, The Interpretation of the Fourth Gospel (London: University Press, 1968), 207-208.
 Jurgen Moltmann, The Crucified God: The Cross of Christ as the Foundation and Criticism of Christian Theology (New York: Harper & Row Publishers, 1974), 205.
 D.A. Carson, The Pillar New Testament Commentary: The Gospel According to John (Grand Rapids: William B. Eerdmans Publishing Company, 1991), 482.
 Samuel Zwemer, The Glory of the Cross (London: Morgan & Scott), 7-8, 16.