You must know that if a person, who has attained a certain degree of perfection, wishes to impart to others, either orally or in writing, any portion of the knowledge which he has acquired of these subjects, he is utterly unable to be as systematic and explicit as he could be in a science of which the method is well known. The same difficulties which he encountered when investigating the subject for himself will attend him when endeavouring to instruct others; viz., at one time the explanation will appear lucid, at another time, obscure; this property of the subject appears to remain the same both to the advanced scholar and to the beginner. For this reason, great theological scholars gave instruction in all such matters only by means of metaphors and allegories. They frequently employed them in forms varying more or less essentially. In most cases they placed the lesson to be illustrated at the beginning, or in the middle, or at the end of the simile. When they could find no simile which from beginning to end corresponded to the idea which was to be illustrated, they divided the subject of the lesson, although in itself one whole, into different parts, and expressed each by a separate figure. Still more obscure are those instances in which one simile is employed to illustrate many subjects, the beginning of the simile representing one thing, the end another. Sometimes the whole metaphor may refer to two cognate subjects in the same branch of knowledge. If we were to teach in these disciplines, without the use of parables and figures, we should be compelled to resort to expressions both profound and transcendental, and by no means more intelligible than metaphors and similes; as though the wise and learned were drawn into this course by the Divine Will, in the same way as they are compelled to follow the laws of nature in matters relating to the body. You are no doubt aware that the Almighty, desiring to lead us to perfection and to improve our state of society, has revealed to us laws which are to regulate our actions. These laws, however, presuppose an advanced state of intellectual culture. We must first form a conception of the Existence of the Creator according to our capabilities; that is, we must have a knowledge of Metaphysics. But this discipline can only be approached after the study of Physics; for the science of Physics borders on Metaphysics, and must even precede it in the course of our studies, as is clear to all who are familiar with these questions. Therefore the Almighty commenced Holy Writ with the description of the Creation, that is, with Physical Science; the subject being on the one hand most weighty and important, and on the other hand our means of fully comprehending those great problems being limited. He described those profound truths, which His Divine Wisdom found it necessary to communicate to us, in allegorical, figurative, and metaphorical language. Our Sages have said (Yemen Midrash on Gen. i. 1), “It is