Authors:

The devil is an optimist if he thinks he can make people worse than they are.

"Die Fackel", no. 277/78 (March 31, 1909), translated in "Anti-Freud: Karl Kraus's Criticism of Psychoanalysis and Psychiatry" by Thomas Szasz, (Ch. 8), 1970.
The devil is an optimist if he thinks he can make people worse than they are.