So they left the island, marvelling whence all those stones had come, and how they had been rained many and deep on that one place.  Said one, "It may be that these are the stones wherewith our Lord and the prophets and the blessed martyrs were stoned, laid up as in a treasury to bear witness on the day of doom."  "It may be," said another, "that these are the stones which Satan, tempting the Lord, bade Him turn into bread, and therefore are they kept for an evidence against the tempter."  "Peradventure these be the stony places," said another, "whereon the good seed fell and perished in its first upspringing, and so they be kept for the admonishment of rash Sea-farers and such as have no long-continuance in well-doing."  But no man among them was satisfied as to the mystery of that strange isle.