"This holy Mother," he writes, "had been desirous of obtaining some insight into the beauty of a soul in grace. Just at that time she was commanded to write a treatise on prayer, about which she knew a great deal from experience. On the eve of the festival of the Most Holy Trinity she was thinking what subject she should choose for this treatise, when God, Who disposes all things in due form and order, granted this desire of hers, and gave her a subject. He showed her a most beautiful crystal globe, made in the shape of a castle, and containing seven mansions, in the seventh and innermost of which was the King of Glory, in the greatest splendour, illumining and beautifying them all. The nearer one got to the centre, the stronger was the light; outside the palace limits everything was foul, dark and infested with toads, vipers and other venomous creatures.