7.

Letter showing the usefulness of proofs, by the Machine. Faith is different from proof. One is human and the other a gift of God. The just shall live by faith. This is the faith that God himself puts into our hearts, often using proof as the instrument. Faith cometh by hearing. But this faith is in our hearts, and makes us say not 'Scio' ['I know'] but 'Credo' ['I believe'].