IN the exercise of the sacred mission entrusted to you by Providence--that of educating our youth to piety and religion--it must have frequently occurred to you, to wish that such an instruction could be imparted, not in the shape of dogmas demanding to be admitted without investigation, but as doctrines addressed to the intellect by proper demonstrations, and finding their way to the heart by stimulating its noblest feelings. The little book that I present to you is intended to satisfy, at least in part, that wish. You will not find in it a complete treatise on Jewish Theology, or a systematic catechism, but only the essential elements, which may serve to the future elaboration of both. You will find deposited in it the rough materials, which some abler hands will perhaps one day employ in constructing an edifice, in which our youth may find a safe refuge from the storms of doubt, unbelief, and irreligion. I have purposed to avoid all exuberant ornaments of style, all pompous parade of erudition, and contented myself with a plain diction, and a strict laconism. I have not quoted authors who preceded me in the same field; I have not called up for investigation what of valuable or defective could be found in them; in short, I have not instituted comparisons, scientific disquisitions, or critical examinations of the opinions of others. A series of aphorisms, simple, plain, unadorned, of easy understanding, drawn from no other source than the Divine Word, presented with the greatest possible perspicuity and precision, progressing in a regular chain of consequential propositions, and containing in few words the most important points of the Israelitish creed--that is the form in which I have thought more proper to present to those, who are already versed in the Bible and in Hebrew literature, a skeleton of the vast religious science, in which they may perceive at a glance the principal characteristic of Judaism, its various ramifications, subsidiary parts, and special tendencies; they may then easily discover and account for the multifarious phases, in which it manifested itself in the various epochs of the universal history of mankind. To supply the deficiencies, to adorn those naked propositions, to provide them with evidence deduced from the sacred text, to enlarge them with appropriate applications, to illustrate them with examples, in fine, to reduce the whole into such a catechistic form as will suit a sound system of instruction--such is the task which remains entrusted to your intelligence, and to your zeal. By employing the proffered materials with that discretion which is peculiar to your ministry, with that method which the tender minds of your pupils require, and with the love inspired by the sublimity and importance of the subject, yours will be the merit of having propagated the seeds of truth that will bring forth charity and universal edification; to me suffices the happiness of