But the most fascinating part of the story is the last one, both as a picture and as to the sense. As Orpheus was proceeding, Euridice following him, the promise was that he was not to look back. The moment he would look back Euridice would be taken away from him. The meaning of this is that the secret of all attainment is faith. If the faith of a person endures as far as ninety-nine miles and one mile remains before gaining the object, even then, if doubt comes, attainment is no more to be expected.