“Still another reason why the payment of taxes implies no consent, or pledge, to support the government, is that the taxpayer does not know, and has no means of knowing, who the particular individuals are who compose "the government." To him "the government" is a myth, an abstraction, an incorporeality, with which he can make no contract, and to which he can give no consent, and make no pledge. He knows it only through its pretended agents. "The government" itself he never sees.”