"Among intellectuals who consider themselves 'scientific,' the phrase 'the nature of man' is apt to have an effect of a red flag on a bull. 'Man has no nature!' is the modern rallying cry; and typucal of the sentiment of political philosophers today was the assertion of a distinguished political theorist some years ago before a meeting of the American Political Science Association that 'man's nature' is a purely theological concept that must be dismissed from any scientific discussion." - Rothbard, The Ethics of Liberty