Kedushat Levi
Genesis 32,11. “please save me from my brother, i.e. from Esau;” Esau represents the negative side of the emanations, Satan, the angel of death, the evil urge within us. Yaakov prays that his brother should not turn out to be a Satan in disguise, just as the evil urge sometimes portrays something sinful as if it were a good deed, a מצוה, so as to enable us to salvage our conscience when following his advice.