from the book Encylcopedia of Freemasonry & its Kindred Sciences
by Albert C. Mackey M. D.
This book is in the public domain.
It is a Landmark that a Book of the Law shall constitute an indispensable part of the furniture of every Lodge. We say, advisedly, Book of the Law, because it is not absolutely required that everywhere the Old and New Testaments shall be used. The Book of the Law is that volume which, by the religion of the country, is believed to contain the revealed will of the Grand Architect of the Universe. Hence, in all Lodges in Christian countries, the Book of the Law is composed of the Old and New Testatements; in a country where Judaism was the prevailing faith, the Old Testament alone would be sufficient; and in Mohammedan countries, and among Mohammedan Freemasons, the Eoran might be substituted. Freemasonry does not attempt to interfere with the peculiar religious faith of its disciples, except so far as relates to the belief in the existence of God, and what necessarily results from that belief.
The Book of the Law is to the Speculative Freemason his spiritual Trestle-Board; without this he cannot labor- whatever he believes to be the revealed will of the Grand Architect constitutes for him this spiritual Trestle-Board, and must ever be before him in his hours of speculative labor, to be the rule and guide of his conduct. The Landmark, therefore, requires that a Book of the Law, a religious code of some kinder purporting to be an exemplar of the reveal will of God, shall form an assential part of the furniture of evety Lodge.