And one people shall be stronger than the other (Gen. 25:23)
Rashi comments: When one rises, the other falls. Jacob and Esau symbolize the struggle between the G-dly soul and the animal soul, between a person’s good and evil inclinations. When a Jew’s G-dly soul is dominant and exerts itself, there is no need to combat the animal soul – it “falls” by itself. Light does not have to fight darkness to illuminate – as soon as it appears, the darkness vanishes. So too, does the light of holiness dispel all evil.