155 AD Justin Martyr “[W]e too would observe the fleshly circumcision, and the Sabbaths, and in short all the feasts, if we did not know for what reason they were enjoined [on] you–namely, on account of your transgressions and the hardness of your heart. . . . [H]ow is it, Trypho, that we would not observe those rites which do not harm us–I speak of fleshly circumcision and Sabbaths and feasts? . . . God enjoined you [Jews] to keep the Sabbath, and impose on you other precepts for a sign, as I have already said, on account of your unrighteousness and that of your fathers” (Dialogue with Trypho the Jew 18, 21).