"What impels every man to the utmost exertion in the service of his fellow man. Is, in the market not compulsion on the part of gendarmes, hangmen and penal courts, it is self interest."

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No man may initiate the use of physical force against others. No man-or group or society or government-has the right to assume the role of a criminal and initiate the use of physical compulsion against any man. Men have the right to use physical force only in retaliation and only against those who initiate its use. The ethical principle involved is simple and clear-cut: it is the difference between murder and self-defense.

— Ayn Rand