Rev. William Landels writes:
The Pilgrim’s Progress is, without question, of all uninspired volumes, the most extraordinary book in the English language. Regard being had to the condition of its author, and the circumstances connected with its production, to its widespread popularity, and its suitableness for readers of every class, there is none to compare with it. It is so well known, that any information concerning either it or its author seems superfluous; and our ingenuity is at a loss to know how to write an introduction for a book for which, above all others, no introduction is required.