"Behold, I will make you fruitful, and multiply you"
Rabbi Aba first explains that shame will not overcome Jacob, since he will keep his promise to his children, [Behold, I will make you fruitful and multiply you,] because to fail would be to invoke shame upon himself. The quotation is a blessing from God, meant to further ensure that Jacob will keep his promise. Rabbi Aba then ends by indicating that at the time of war against Amalek, only The Creator would go to fight.
In truth, a man lacks the full power to overthrow the Satan, doubts and internal demons that dwell within him. Nonetheless, when a man willingly overcomes his doubt - known by the code word Amalek, The Creator will fight for him throughout his life, thus assuring a man's victory over the dark side and providing him with a life of fulfillment. This is precisely what occurs herein, as we peruse the letters of this passage with the consciousness and intent to eradicate our doubts and demons and allow The Creator to fight on our behalf.