If you or any one else will take the trouble and have the intelligence and patience to follow and examine every one of my crimes and actions you will find that I have consistently followed one idea thru all my life. I preyed upon the weak the harmless or unsuspecting. Those I have harmed were all either weaklings either mentally or physically. Those who were strong in either mind or body I first lied to and led into a trap where they were either asleep or drunk or helpless in some way. I always had all the best of it, because I knew ahead of time just what to expect and the others did not. I therefore was strong in my knowledge and stronger in body than those preyed upon. This lesson I was taught by others. Might makes right. [sic]

From a undated letter to Henry Lesser, Lustmord: The Writings and Artifacts of Murderers, p. 193, (1997), Brian King, ed. ISBN 096503240X