Here is an excerpt from the blog Glory to God for All Things where Father Stephen posts about just this difference in Theology of the head (systematic) and the heart(cross).
The following excerpt was sent by a dear friend and a frequent reader of the blog. It is taken from Richard Wurmbrand’s With God in Solitary Confinement. Wurmbrand, a Lutheran pastor who was imprisoned under the communists in Romania, always spoke well of the Orthodox whom he encountered in those places of confinement, and brings the insight that suffering for Christ often brings. I was deeply moved by this quote.
“I once tried to explain ‘systematic theology’ to a Russian pastor of the Underground Church, who had never seen a whole New Testament. Systematically, I began to explain to him the teaching about the Godhead, about its unity in three Persons, the teaching about original sin, about the Fall, about salvation, about the Church, about the sacraments, about the Bible as infallible revelation.
“He listened attentively. When I had finished, he asked me a most surprising question: ‘Have those who thought out these theological systems and wrote them down in such perfect order ever carried a cross?’ He went on. ‘A man cannot think systematically even when he has a bad toothache. How can a man who is carrying a cross think systematically? But a Christian has to be more than the bearer of a heavy cross; he shares Christ’s crucifixion. The pains of Christ are his, and the pains of all creation. There is no grief and no suffering in the whole world which should not grieve him also. If a man is crucified with Christ, how can he think systematically? Can there be that kind of thought on a cross?
“’Jesus Himself thought unsystematically on the cross. He began with forgiveness; He spoke of a paradise in which even a robber had a place; then he despaired that perhaps there might be no place in paradise even for Him, the Son of God. He felt Himself forsaken. His thirst was so unbearable that He asked for water. Then He surrendered His spirit into His Father’s hand. But there followed no serenity, only a loud cry. Thank you for what you have been trying to teach me. I have the impression that you were only repeating, without much conviction, what others have taught you.’