What is the theme in Man's Search for Meaning by Viktor Frankl?

Choosing one's feelings is an important theme in the book. The notion that individuals have the psychological freedom to determine their thoughts and feelings is fundamental to the philosophy of Frankl's writing. He emphasizes that psychological reactions are not determined for people by any stimuli, no matter how powerful or devastating. Examples detailing the horrific experiences of imprisonment in concentration camps are provided to reinforce this theme. Specifically, Frankl illustrates how it is possible to be continually exposed to a negative environment of death and despair, yet still find a means of discovering meaning in this suffering.