[Referring to The Heidelberg Disputation...]
According to Martin Luther's terminology, the "theologians of glory" are those who build their theology in the light of what they expect God to be like—and, surprise, surprise, they make God to look something like themselves. The "theologians of the cross," however, are those who build their theology in the light of God's own revelation of himself in Christ hanging on the cross.
The implications of this position are revolutionary. For a start, Luther is demanding that the entire theological vocabulary be revised in light of the cross. Take for example the word power. When theologians of glory read about divine power in the Bible, or use the term in their own theology, they assume that it is analogous to human power. They suppose that they can arrive at an understanding of divine power by magnifying to an infinite degree the most powerful thing of which they can think. In light of the cross, however, this understanding of divine power is the very opposite of what divine power is all about. Divine power is revealed in the weakness of the cross, for it is in his apparent defeat at the hands of evil powers and corrupt earthly authorities that Jesus shows his divine power in the conquest of death and of all the powers of evil. So when a Christian talks about divine power, or even about church or Christian power, it is to be conceived of in terms of the cross—power hidden in the form of weakness.
Luther's Theology of the Cross
by Carl Trueman