At first sight they wear an aspect of the most innocent simplicity. The first of them, known as the rule of “light and heavy,” is simply an application of the ordinary argument “from less to greater.”1 The second, the rule of “equivalence,” infers a relation between two subjects from the occurrence of identical expressions. Thus it is said both of the Sabbath and the Paschal sacrifice that each must be “at its due season,” and if this means that the daily sacrifice must be offered on the Sabbath,
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