The second class contains all those precepts which are known as ‏מצות דרבנן‎ “Rabbinical precepts,” ‏תקנות‎ and ‏מנהגים‎ “Institutions” and “Customs.” But these imply no addition to the Torah; they are merely byelaws and regulations as regards the method of carrying out the laws of the Pentateuch, and are designed to facilitate or ensure their fulfilment, and to prevent ourselves from forgetting or disregarding them. Our teachers, the Rabbis, made it a matter of conscience to describe their own regulations as ‏דרבנן‎ non-Pentateuchical, and throughout the Oral Law and the entire Talmudic literature the distinction between ‏דרבנן‎ and ‏מן התורה‎ is noted and scrupulously upheld. It is useless to investigate whether it would be in harmony with the immutability of the Divine Being to change the laws or any of them, or to grant a new revelation. Certainly the words “I, the Lord, have not changed” (Mal. iii. 6) have great weight; so also, “For God is not a son of man that he should change his mind” (Num. xxiii. 19). But the fact that the laws were given by God as “an everlasting statute for all generations” makes all philosophical speculation on that point superfluous. Persons who address us in the name of God as His messengers, and bid us turn away from any of the laws commanded in the Pentateuch, are in our eyes impostors, who, knowingly or unknowingly, give forth their own opinions as Divine inspirations. 3. REWARD AND PUNISHMENT, ‏שכר ועונש‎. “Behold I have set before thee this day life and good, and death and evil: in that I command thee this day to love the Lord thy God, to walk in his ways, and to keep his commandments and his statutes and his judgments, that thou mayest live and multiply, and that the Lord thy God may bless thee in the land whither thou passest over Jordan to go in to possess it” (Deut. xxx. 15). “I call heaven and earth to witness against you this day, that I have set before thee life and death, the blessing and the curse: therefore choose life, that thou mayest live, thou and thy seed: to love the Lord thy God, to obey his voice, and to cleave unto him: for that is thy life and the length of thy days” (Ibid. xxx. 19, 20).