Musar zu Bereschit 33:14

In order to survive in our lengthy exile we must employ the weapons of repentance, prayer and charity so as to mobilize the support of G–d on our behalf. The equivalent of "war" is repentance, which reflects the battle with our evil urge. He who can conquer his baser urges has proved himself to be a mighty warrior. This condition will prevail until the prophecy that we will conquer Mount Se'ir will be fulfilled. The redemption will come as a result of repentance, as we know from: ובא לציון גואל ולשבי פשע ביעקב "The redeemer will come to Zion and to those in Jacob who have repented their iniquities" (Isaiah 59, 20).