The effective centrist avoids the pitfalls of “opportunism” by keeping the objective firmly in view, and, in particular, by never acting in a manner, or speaking in a manner, inconsistent with the full libertarian position. In the name of practicality, the opportunist not only loses any chance of advancing others toward the ultimate goal, but he himself gradually loses sight of that goal—as happens with any “sellout” of principle. Thus, suppose that one is writing about taxation. It is not incumbent on the libertarian to always proclaim his full “anarchist” position in whatever he writes; but it is incumbent upon him in no way to praise taxation or condone it; he should simply leave this perhaps glaring vacuum, and wait for the eager reader to begin to question and perhaps come to you for further enlightenment. But if the libertarian says, “Of course, some taxes must be levied,” or something of the sort, he has betrayed the cause.
— Murray N. Rothbard, Confidential Memo to Volker Fund, 1961.