“Politics, just as economic pursuits, may be a man's avocation or his vocation. One may engage in politics, and hence seek to influence the distribution of power within and between political structures, as an 'occasional' politician… Politics as an avocation is today practiced by all those party agents and heads of voluntary political associations who, as a rule, are politically active only in case of need and for whom politics is, neither materially nor ideally, 'their life' in the first place…
There are two ways of making politics one's vocation: Either one lives 'for' politics or one lives 'off' politics. By no means is this contrast an exclusive one. The rule is, rather, that man does both, at least in thought, and certainly he also does both in practice. He who lives 'for' politics makes politics his life, in an internal sense. Either he enjoys the naked possession of the power he exerts, or he nourishes his inner balance and self-feeling by the consciousness that his life has meaning in the service of a 'cause.' In this internal sense, every sincere man who lives for a cause also lives off this cause. The distinction hence refers to a much more substantial aspect of the matter, namely, to the economic. He who strives to make politics a permanent source of income lives 'off' politics as a vocation, whereas he who does not do this lives 'for' politics. Under the dominance of the private property order, some--if you wish-- very trivial preconditions must exist in order for a person to be able to live 'for' politics in this economic sense. Under normal conditions, the politician must be economically independent of the income politics can bring him. This means, quite simply, that the politician must be wealthy or must have a personal position in life which yields a sufficient income.”