The Sermons of Martin Luther: Lenker Edition

What, then, constitutes the mysteries of God? Simply Christ himself; that is, faith and the Gospel concerning Christ. The whole Gospel teaching is far beyond the grasp of our reason and our physical sense; it is hidden to the world. It can be apprehended only by faith; as Christ says in Matthew 11:25: "I thank thee, O father, Lord of heaven and earth, that thou didst hide these things from the wise and understanding, and didst reveal them unto babes." And as Paul tells us (1 Corinthians 2:7-8): "We speak God's wisdom in a mystery, which none of the rulers of this world hath known."