Dear friend, what good does reason do for faith and God’s Word? Is it not [reason] which most strongly opposes faith and the Word of God, so that no one can come to faith because of [reason]? It will not tolerate God’s Word unless it is blinded and disgraced, so that we must die to [reason] and become fools, as unreasonable and unwise as a little child, before we believe and receive God’s grace. Christ says: “Unless you turn and become like children, you will never enter the kingdom of heaven” (Matthew 18 [:3]). How often does Christ tell us that we must become children and fools? How often does He condemn reason?
37. Likewise, tell me what kind of reason the little children had whom Christ embraced and blessed and to whom He gave heaven? Were they not still without reason? Why, then, does He command them to be brought to Him and bless them? Where did they get the faith which makes them children of the kingdom of heaven? Yes, just because they are without reason and foolish, they are better adapted for faith than adults and the wise, for whom reason is always in the way and refuses to push its big head through the narrow door.
If we are talking here about faith and God’s work, then we must not look at reason or its works. Here God works alone, and reason is dead, blind, and like a stupid log in this work, so that Scripture is right when it says, “God is astonishing in His saints” [cf. Ps. 68:35 (67:36 Vg)]. Likewise: “As the heavens are higher than the earth, so are My ways higher than your ways and My thoughts than your thoughts” (Isaiah 55 [:9]). (AE 76:263 from Concordia Publishing House Saint Louis, MO)(Church Postil II)