I do not presume to think that this treatise settles every doubt in the minds of those who understand it, but I maintain that it settles the greater part of their difficulties. No intelligent man will require and expect that on introducing any subject I shall completely exhaust it; or that on commencing the exposition of a figure I shall fully explain all its parts. Such a course could not be followed by a teacher in a viva voce exposition, much less by an author in writing a book, without becoming a target for every foolish conceited person to discharge the arrows of folly at him. Some general principles bearing upon this point have been fully discussed in our works on the Talmud, and we have there called the attention of the reader to many themes of this kind. We also stated (Mishneh torah, I. ii. 12, and iv. 10) that the expression Maʻase Bereshit (Account of the Creation) signified “Natural Science,” and Maʻaseh Mercabah (“Description of the Chariot”) Metaphysics, and we explained the force of the Rabbinical dictum, “The Maʻaseh Mercabah must not be fully expounded even in the presence of a single student, unless he be wise and able to reason for himself, and even then you should merely acquaint him with the heads of the different sections of the subject.” (Babyl. Talm. Ḥagigah, fol. 11 b). You must, therefore, not expect from me more than such heads. And even these have not been methodically and systematically arranged in this work, but have been, on the contrary, scattered, and are interspersed with other topics which we shall have occasion to explain. My object in adopting this arrangement is that the truths should be at one time apparent, and at another time concealed. Thus we shall not be in opposition to the Divine Will (from which it is wrong to deviate) which has withheld from the multitude the truths required for the knowledge of God, according to the words, “The secret of the Lord is with them that fear Him” (Ps. xxv. 14).