What prompted Frankl to speak to the prisoners about hope? What did he say?

Morale was low when Frankl spoke to the prisoners about hope because the prisoners were forced to fast for a day because they would not identify the semi-starved prisoner who stole potatoes. Frankl spoke to them about the importance of not losing hope despite a situation that seemed hopeless. He writes that the desperateness of the situation "did not detract from its dignity and its meaning."