17. When orthodoxy enters and explains all those things which priests preach from the Word concerning faith that we ought to believe in God, concerning charity towards the neighbor, conversion, repentance, and the life of piety and spiritual life, they fall as it were into a bucket; then they are overthrown, as when one destroys a dwelling or a house, even so that nothing but ruins remain. The preachers say that these things are not true, unless you believe thus. What does charity, repentance, etc., effect? The very Word then falls, and so forth. It is as if someone undermines a wall, by digging ditches under it. All things are overthrown.