The Torah in Parashat Vaera traces the lineage of Moshe Rabbenu, informing us that he was son of Amram and Yochebed. Amram was a grandson of Yakaob Abinu's third son, Levi – specifically, he was the son of Levi's son, Kehat. Astonishingly, the Torah relates, Yochebed was Amram's aunt – she was the daughter of Levi, the sister of Kehat. The commentaries explain that Yochebed and Kehat had different mothers, and thus they were half-siblings. As such, the marriage between Amram and Yochebed was not forbidden by the Noachide laws, which apply to all mankind. These laws forbid marrying one's parent's full sister, but not a parent's half-sister. This union would, however, be proscribed by the Torah given to Beneh Yisrael. It turns out, then, that Moshe – the greatest leader and prophet in our nation's history, who brought us the Torah – was the product of a marriage that Torah law forbids. Moshe is not the only great leader with less-than-pristine origins. The Davidic line, which began with David and Shlomo and will – we pray very soon – culminate with Mashiah, also has its origins in problematic relationships. David descended from Peretz – the product of the relationship between Yehuda and his daughter-in-law, Tamar. David's great-grandmother was Rut, a convert from the nation of Moab, and although it was ultimately concluded that this marriage was permissible, there was considerable controversy as to whether a man may marry a woman from Moab. And the founder of the nation of Moab, Rut's ancestor, was conceived when Lot's daughter gave her father wine and had a relationship with him, thinking they this was needed in order to maintain the earth's population. Rav Menahem Recanti (Italy, 1223-1290) offers an explanation for this phenomenon, for why the great leaders emerged from less-than-ideal origins. The Satan, he writes, is always seeking to sabotage the rise of these righteous figures, to block these holy souls from descending into the world. Moshe brought us the Torah, which is the "antidote" to the Yeser Ha'ra (evil inclination), the greatest weapon we have in our struggle to overcome the Satan's efforts to lure us away from the service of G-d. And the Gemara teaches that when Mashiah arrives, he will destroy the Satan so it could no longer hurt the Jewish People. Therefore, the Satan will do everything in its power to obstruct the transmission of Torah, and to prevent the arrival of Mashiah. For this reason, Hashem arranged that Moshe and David would be produced from unions that the Satan would never bother to disrupt. The Satan welcomes problematic relationships such as those of Lot and his daughters, Yehuda and Tamar, and Amram and Yochebed. He would never try to interfere with them, because this is precisely what he wants – relationships that are from the Torah's ideal marriage. Moshe and David needed to be produced this way for the purpose of avoiding the Satan's interference. This reminds us never to be discouraged by the challenges that we face in the pursuit of greatness. Whenever we try to achieve something significant, we are going to confront obstacles. Whether it's in the process of finding a spouse and raising a family, the process of learning Torah and spiritual growth, starting a new organization or project – the Satan is always going to try to interfere. Rather than be surprised and discouraged by the problems that arise, we should expect them, stay strong, and proceed with confidence, trusting that Hashem is always helping us in our efforts to defeat the Satan and achieve to the very best of our ability.