Those who pay no taxes, disposing by their votes of other people's money, have every motive to be lavish and none to economize.
 John Stuart Mill, Considerations on Representative Government (1861). copy citation

Context

“and it would, after a few years, exclude none but those who cared so little for the privilege, that their vote, if given, would not in general be an indication of any real political opinion. It is also important, that the assembly which votes the taxes, either general or local, should be elected exclusively by those who pay something towards the taxes imposed. Those who pay no taxes, disposing by their votes of other people's money, have every motive to be lavish and none to economize. As far as money matters are concerned, any power of voting possessed by them is a violation of the fundamental principle of free government, a severance of the power of control from the interest in its beneficial exercise.” source