"The author of the Pilgrim's Progress has also left an autobiography... Grace Abounding, which is as remarkable from a psychological as from an historical point of view. This book is the best study for the origin and essence of Puritanism. It is a work which... has the significance for the seventeenth century that the Confessiones of St. Augustin have for the fifth, and the Confessions of Rousseau for the eighteenth. In these three books beats the full and living pulse of the times in which they were composed."