DEUT296 … Nahmanides' comments on "be holy" (Leviticus 19:2) and "do the straight and a good" [this verse]--cited in many or most Modern Orthodox essays on how halakhah relates to ethics--refer to a standard that is inferred from other laws of the Torah, not from an independent standard. (Nachmanides interprets these verses, respectively, as "do more than the law requires" [which prevents untoward results] and "when approaching cases that have no precedents, use ethical reasoning" [which covers cases where the rules run out]). Indeed, he draws a parallel between "be holy," "do the straight and the good," and the general law tishbot (rest) on Shabbat. The latter's applications are extrapolated from other laws of the Shabbat and clearly do not come from an independent ethic. (By David Shatz, "Ethical Theories in the Orthodox Movement"