A god who let us prove his existence would be an idol.

Every Christian must be fully Christian by bringing God into his whole life, not merely into some spiritual realm.

There is a wrong way of staying in the world and a wrong way of fleeing from it. In both cases we are fashioning ourselves according to the world.

I saw Pastor Bonhoeffer, before taking off his prison garb, kneeling on the floor praying fervently to his God. I was most deeply moved by the way this lovable man prayed, so devout and so certain that God heard his prayer. At the place of execution, he again said a prayer and then climbed the steps to the gallows, brave and composed. His death ensued in a few seconds. In the almost 50 years that I have worked as a doctor, I have hardly ever seen a man die so entirely submissive to the will of God.

If I sit next to a madman as he drives a car into a group of innocent bystanders, I can't, as a Christian, simply wait for the catastrophe, then comfort the wounded and bury the dead. I must try to wrestle the steering wheel out of the hands of the driver.

The life of discipleship is not the hero-worship we would pay to a good master, but obedience to the Son of God.

When one person is struck by the Word, he speaks it to others. God has willed that we should seek and find His living Word in the witness of a brother, in the mouth of man. Therefore, the Christian needs another Christian who speaks God’s Word to him. The Christ in his own heart is weaker than the Christ in the word of his brother; his own heart is uncertain, his brother’s is sure.