" Apathy, the main symptom of the second phase, was a necessary mechanism of self-defense. Reality dimmed, and all efforts and all emotions were centered on one task: preserving one’s own life and that of the other fellow. It was typical to hear the prisoners, while they were being herded back to camp from their work sites in the evening, sigh with relief and say, “Well, another day is over. "

― Viktor E. Frankl , Man's Search for Meaning