From Man’s Search for Meaning by Viktor E. Frankl:
We who lived in concentration camps can remember the men who walked through the huts comforting others, giving away their last piece of bread. They may have been few in number, but they offer sufficient proof that everything can be taken from a man but one thing: the last of the human freedoms—to choose one’s attitude in any given set of circumstances, to choose one’s own way.
And there were always choices to make. Every day, every hour, offered the opportunity to make a decision, a decision which determined whether you would or would not submit to those powers which threatened to rob you of your very self, your inner freedom; which determined whether or not you would become the plaything of circumstance, renouncing freedom and dignity to become molded into the form of the typical inmate.
Even though conditions such as lack of sleep, insufficient food and various mental stresses may suggest that the inmates were bound to react in certain ways, in the final analysis it becomes clear that the sort of person the prisoner became was the result of an inner decision, and not the result of camp influences alone. Fundamentally, therefore, any man can, even under such circumstances, decide what shall become of him—mentally and spiritually. He may retain his human dignity even in a concentration camp.
This young woman knew she would die in the next few days. But when I talked to her she was cheerful in spite of this knowledge. “I am grateful that fate has hit me so hard,” she told me. “In my former life I was spoiled and did not take spiritual accomplishments seriously.” Pointing through the window of the hut, she said, “This tree here is the only friend I have in my loneliness.” Through the window she could see just one branch of a chestnut tree, and on the branch were two blossoms. “I often talk to this tree,” she said to me. I was startled and didn’t quite know how to take her words. Was she delirious? Did she have occasional hallucinations? Anxiously I asked her if the tree replied. “Yes.” What did it say to her? She answered, “It said to me, ‘I am here – I am here – I am life, eternal life.’”