Henry David Thoreau, via Fabius Maximus:

Law never made men a whit more just; and, by means of their respect for it, even the well-disposed are daily made the agents on injustice.

… In most cases there is no free exercise whatever of the judgement or of the moral sense; but they put themselves on a level with wood and earth and stones; and wooden men can perhaps be manufactured that will serve the purpose as well. Such command no more respect than men of straw or a lump of dirt. They have the same sort of worth only as horses and dogs.

Yet such as these even are commonly esteemed good citizens. Others — as most legislators, politicians, lawyers, ministers, and office-holders — serve the state chiefly with their heads; and, as the rarely make any moral distinctions, they are as likely to serve the devil, without intending it, as God. A very few — as heroes, patriots, martyrs, reformers in the great sense, and men — serve the state with their consciences also, and so necessarily resist it for the most part; and they are commonly treated as enemies by it.