Tanya for the 4th of Shevat

The kelipah can obstruct only those matters that do not directly affect the G-dly soul’s level of chochmah. Therefore, in such matters as faith—a derivative of chochmah—kelipah can neither penetrate nor obstruct. Consequently, in such matters, the Jew is aware that to succumb to sin would mean being torn away from G-d, and therefore, he will readily lay down his life rather than sin.