"a white stone..."
See in text (Chapter XXXIV)
Compare this description of St. John with Jane's earlier description of Mr. Brocklehurst as a “black pillar.” Both men represent one aspect of religion: one malevolent and the other benevolent. In addition, these men are associated with solid masses of cold stone or marble, suggesting their lack of emotion and affection. Their way of practicing religion contrasts with Jane’s, who does not follow the Bible so closely.