The Book: "So he settled on a method to help him succeed in his quest. He devised a little book and set it up in such a way that he could examine himself and mark his progress at the end of each day." "I entered upon the execution of this plan for self-examination and continued it, with occasional intermission, but I always carried my little book with me. . . ." "And it may be well my posterity should be informed that to this little artifice with the blessing of God, their ancestor owed the constant felicity of his life down to his seventy-ninth year in which this is written. . . . I hope, therefore, that some of my descendants may follow the example and reap the benefits."