statutes, if they produced no advantage and removed no evil, why then should he who believes in them and follows them be wise, reasonable, and so excellent as to raise the admiration of all nations? But the truth is undoubtedly as we have said, that every one of the six hundred and thirteen precepts serves to inculcate some truth, to remove some erroneous opinion, to establish proper relations in society, to diminish evil, to train in good manners or to warn against bad habits. All this depends on three things: opinions, morals, and social conduct. We do not count words, because precepts, whether positive or negative, if they relate to speech, belong to those precepts which regulate our social conduct, or to those which spread truth, or to those which teach morals. Thus these three principles suffice for assigning a reason for every one of the Divine commandments.
CHAPTER XXXII
ON considering the Divine acts, or the processes of Nature, we get an insight into the prudence and wisdom of God as displayed in the creation of animals, with the gradual development of the movements of their limbs and the relative positions of the latter, and we perceive also His wisdom and plan in the successive and gradual development of the whole condition of each individual. The gradual development of the animals' movements and the relative position of the limbs may be illustrated by the brain. The front part is very soft, the back part is a little hard, the spinal marrow is still harder, and the farther it extends the harder it becomes. The nerves are the organs of sensation and motion. Some nerves are only required for sensation, or for slight movements, as, e.g., the movement of the eyelids or of the jaws; these nerves originate in the brain. The nerves which are required for the movements of the limbs come from the spinal marrow. But nerves, even those that come directly from the spinal cord, are too soft to set the joints in motion; therefore God made the following arrangement: the nerves branch out into fibres which are covered with flesh, and become muscles: the nerves that come forth at the extremities of the muscles and have already commenced to harden, and to combine with hard pieces of ligaments, are the sinews which are joined and attached to the limbs. By this gradual development the nerves are enabled to set the limbs in motion. I quote this one instance because it is the most evident of the wonders described in the book On the use of the limbs; but the use of the limbs is clearly perceived by all who examine them with a sharp eye. In a similar manner did God provide for each individual animal of the class of mammalia. When such an animal is born it is extremely tender, and cannot be fed with dry food. Therefore breasts were provided which yield milk, and the young can be fed with moist food which corresponds to the condition of the limbs of the animal, until the latter have gradually become dry and hard.
Many precepts in our Law are the result of a similar course adopted by the same Supreme Being. It is, namely, impossible to go suddenly from one extreme to the other: it is therefore according to the nature of man impossible for him suddenly to discontinue everything to which he has been accustomed. Now God sent Moses to make [the Israelites] a kingdom of priests and a holy nation (Exod. xix. 6) by means of the knowledge of God. Comp. "
