"Too cheerful a morality is a loose morality; it is appropriate only to decadent peoples and is found only among them."

"Irrespective of any external regulatory force, our capacity for feeling is in itself an insatiable and bottomless abyss."

"Crime is normal because a society exempt from it is utterly impossible."

"Religion is a system of symbols that express the collective sentiments of a group."

"The primary cause of suicide is an excess or deficit of social integration."