This is a masterly work and deals with a subject which at the present day is being too much neglected and lost sight of. The Word of God sets forth clearly that there is such a thing as punishment or penalty for sin. This is retributive justice, and the doctrine of it has as clear and firm foundations in fact and the nature of things as it has in revelation. The doctrine of retribution is one which cannot be ignored with safety. No sincere inquirer after truth but will be strengthened and helped by a careful perusal of the sublime truths set forth by the author of this peerless book. I call it peerless, as it stands almost alone at the present time in its presentation of this truth. It is logical, concise and carries conviction in its utterance. There has never been a time when such a book was more needed. . . The best book on Divine Penology is the Scriptures, and the next best on this subject that we have seen is this little volume by Dr. Hartman. It should be read by every Christian and by whomsoever desires to search out and to know the truth.
—Christian Work: Family Newspaper, 1899
“The logic of eternal punishment is more forcefully presented in Divine Penology than in any other book on hell I have read. It is an unequalled, if idiosyncratic, treatise which is much needed in our day. I cannot recommend it highly enough.”
—Paul Dirks, Author of Is There Anything Good About Hell?