The only part of the conduct of any one, for which he is amenable to society, is that which concerns others. In the part which merely concerns himself, his independence, is, of right, absolute. Over himself, over his own body and mind, the individual is sovereign.
John Stuart Mill (May 20, 1806 May 8, 1873), an English philosopher and political economist, was an influential classical liberal thinker of the 19th century. He was an advocate of utilitarianism, the ethical theory first proposed by his godfather Jeremy Bentham.