Luther attacks the Anselmian point of view by saying that justification by faith is the only point of certainty, and that it is not our contribution to salvation that can give us quiet consolation. He says that in Erasmus the meaning of Christ is denied and finally that the honor of God is denied.

I think that here we have a very fundamental difference between the two attitudes.

The attitude of the humanist is that of detached analysis. And if it comes to synthesis, it is that of the moralist, in contrast to the prophet, who sees everything in the light of God alone Luther’s conf lict with the Evangelical Radicals: This is especially important for you because the prevailing type in this country is not produced by the Reformation directly, but by the indirect effect of the Reformation through the movements of Evangelical Radicalism. What is the meaning of this concept? First of all we must agree that they all are dependent on Luther. They have a long history in the Middle Ages, but only Luther liberated the tendencies which were alive in the Middle Ages from the suppression to which they were condemned.

Luther’s emphasis on almost all points was accepted by the Evangelical Radicals, but then they went beyond him. They had the feeling that he stood half-way. First of all his principle of the Bible – to which we come tomorrow – is something which they attacked. God has not spoken but once, in the past, and then has become silent; but He always speaks, He speaks in the heart or depths of every man, if this man is prepared by his own cross to hear. The Spirit is in the depths of the heart, although not by ourselves but from God. From this point of view, he says that it is always possible that the Spirit speaks through individuals.

Now I speak mostly of Thomas Muenzer, who is the most creative of the Evangelical Radicals. But in order to receive this Spirit, man must participate in the cross.

Luther, he said, preaches a sweet Christ – the Christ of forgiveness. But we must, he said, also preach the bitter Christ, namely the Christ who says that we must take His cross upon ourselves. The cross is, so we can say, the extreme, the boundary situation. It is internal and external. And Muenzer, in an astonishing way, expresses that in modern existentialist categories. It is the human finiteness which, if he realizes it, produces in him a disgust about the whole world. Then he really becomes poor in spirit. Then the anxiety of creaturely existence grasps him. Then he finds that courage is possible. But then it happens that God appears to him and that he is transformed. And if this has happened to him, then he can have very special revelations. He can have individual visions, not only about theology as a whole, but also about matter of the daily life.

These groups felt on this basis that they are the real fulfillment of the Reformation, that Luther remained half-Catholic, that they are elected; while the Roman church has no certainty for any individual with respect to justification; while Luther has the certainty of justification but not of election; while Calvin had the certainty not only of justification but at least to a great extent also of being elected – Muenzer and his followers had the certainty of being elected within a group of elected, namely the sectarian group.

From this point of view of the inner Spirit, all sacraments fall down. And the immediacy of the procession of the Spirit makes even what is left of the office of the minister unnecessary in the sectarian groups. Instead of that, they have another impetus, namely the transformation of society either by suffering, if they cannot change it, and abstinence from arms and oaths and public office and all those things involving you in state existence; or if they are radical, then by political measures, by the sword overcoming the evil society in which one lives; and then one becomes a religious socialist. These two movements we have in that period, and these movements and the whole attitude have influenced this country very much.
Paul Tillich, A History Of Christian Thought – Table of Contents