everything that was not connected with the immediate task of keeping oneself and one’s closest friends alive lost its value. Everything was sacrificed to this end. A man’s character became involved to the point that he was caught in a mental turmoil which threatened all the values he held and threw them into doubt. Under the influence of a world which no longer recognized the value of human life and human dignity, which had robbed man of his will and had made him an object to be exterminated (having planned, however, to make full use of him first—to the last ounce of his physical resources)—under this influence the personal ego finally suffered a loss of values.

— Viktor E. Frankl, Man’s Search for Meaning, 1946, Beacon Press (2006 edition), p. 67