Very daring is his remark, when proving that Reward and Punishment, Immortality of the soul, and Resurrection of the dead must not be considered as the basis of Judaism, since the highest ideal of religion is to serve God without any hope of reward. Even more daring are his words concerning the Immutability of the Law. He says: “Some have argued that, since God is perfection, so must also His law be perfect, and thus unsusceptible of improvement.” But he does not think this argument conclusive, though the fact in itself (the Immutability of the Law) is true. For one might answer that this perfection of the Torah could only be in accordance with the intelligence of those for whom it was meant; but as soon as the recipients of the Torah have advanced to a higher state of perfection, the Torah must also be altered to suit their advanced intelligence. A pupil of Chasdai illustrates the words of his master by a medical parallel. The physician has to adapt his medicaments to the various stages through which his patient has to pass. That he changes his prescription does not, however, imply that his medical knowledge is imperfect, or that his earlier remedies were ignorantly chosen; the varying condition of the invalid was the cause of the variation in the doctor’s treatment. Similarly, were not the Immutability of the Torah a “doctrine,” one might maintain that the perfection of the Torah would not be inconsistent with the assumption that it was susceptible of modification, in accordance with our changing and progressive circumstances. But all these arguments are purely of a theoretic character; for, practically, every Jew, according to Chasdai, has to accept all these beliefs, whether he terms them fundamental teachings or only Jewish doctrines.(128)