Doctrines which can stand the trial of logic and reason can do without persecuting skeptics. - Ludwig von Mises

The criterion of truth is that it works even if nobody is prepared to acknowledge it.

Human action is purposeful behavior.

Permanent mass unemployment destroys the moral foundations of the social order. The young people, who, having finished their training for work, are forced to remain idle, are the ferment out of which the most radical political movements are formed. In their ranks the soldiers of the coming revolutions are recruited.