“A murderer is only an extroverted suicide.”
“Civilizations die from suicide, not by murder.”
“If I turn up suicided in the morning, it was murder.”
“That's how we stay young these days: murder and suicide.”
“For if it's all the rest of us who are killed by the suicide, it's himself whom the murderer kills; only he has to do is over, and over, and over.”
“Suicide is a form of murder - premeditated murder. It isn't something you do the first time you think of doing it. It takes getting used to. And you need the means, the opportunity, the motive. A successful suicide demands good organization and a cool head, both of which are usually incompatible with the suicidal state of mind.”