“But why are not the Scriptures sufficient? They are God’s Word.”

The other put down her embroidery again, and smiled up into the girl’s puzzled eyes.

“Well, my child,” she said, “do they seem sufficient, when you look at Christendom now? If they are so clear, how is it that you have the Lutherans, and the Anabaptists, and the Family of Love, and the Calvinists, and the Church of England, all saying they hold to the Scriptures alone. Nay, nay; the Scriptures are the grammar, and the Church is the dame that teaches out of it, and she knows so well much that is not in the grammar, and we name that tradition. But where there is no dame to teach, the children soon fall a-fighting about the book and the meaning of it.”

Isabel looked at Mistress Margaret a moment, and then turned back again to the window in silence.

At another time they had a word or two about Peter’s prerogatives.

“Surely,” said Isabel suddenly, as they walked together in the garden, “Christ is the one Foundation of the Church, St. Paul tells us so expressly.”

“Yes, my dear,” said the nun, “but then Christ our Lord said: ‘Thou art Peter, and on this rock I will build my Church.’ So he who is the only Good Shepherd, said to Peter, ‘Feed My sheep’; and He that is Clavis David and that openeth and none shutteth said to him, ‘I will give thee the keys, and whatsoever thou shalt bind on earth shall be bound in heaven.’ That is why we call Peter the Vicar of Christ.”

Isabel raised her eyebrows.

“Surely, surely——” she began.

“Yes, my child,” said Mistress Margaret, “I know it is new and strange to you; but it was not to your grandfather or his forbears: to them, as to me, it is the plain meaning of the words. We Catholics are a simple folk. We hold that what our Saviour said simply He meant simply: as we do in the sacred mystery of His Body and Blood. To us, you know,” she went on, smiling, with a hand on the girl’s arm, “it seems as if you Protestants twisted the Word of God against all justice.”