Elie Wiesel did learn many lessons but the most predominant lesson he learned was the stong will of humans to survive, no matter what the circumstances. He witnessed a son attack his own father in the cattle train over a bit of crust. He himself was reduced to only thoughts of bread and soup; not revenge, not freedom. Simply bread and soup to keep himself alive. He also witnessed the Rabbi's son abandon his own father during the forced march through the snow when the son realized his father was slowing him down. Survival, the will to live of human beings was by far the strongest lesson Wiesel learned during his eternal "Night" that never ended.