In the quaint and classic allegory of Christian living, The Pilgrim's Progress, John Bunyan has Christian and Hopeful in the Dark Valley where they have many trying experiences. Then they are taken by shepherds into the Delectable Mountains, and here they are permitted to look through the Perspective Glass. Such an instrument is now known as a telescope or a binocular, but Bunyan called it a Perspective…
CSS Publishing Company, Inc.,