“This work, which covers a space of sixty-eight years, from the first commencement of the Moravian labors among the red men to the death of the venerable Zeisberger, must still be considered in a historical point of view, as one of the standard records of the times. Mr. Heckewelder was an eye-witness of a great proportion of what he relates, and had the best opportunities of acquiring information. Of his honesty, too, those who have read his unassuming work, can entertain no doubt; he represents things as they were without any attempt at coloring or ornament.”
- Peter G. Thomson, A Bibliography of the State of Ohio (1880)