What sentence in the washwomen is important?

"This hands spoke of stubbornness of mankind, of the will to work not only as one's strength permits but beyond the limits of one's power."

in night, why are wiesel and his father evacuated from the auschwitz concentration camp? a massive escape makes the nazis question the security of auschwitz. they are assigned to work as laborers in a factory at another camp, buna. hitler has ordered that all remaining jews be relocated within german borders. the german army needs the camp guards to go to the battle front for a last-chance defense.